10 Best Spark Plugs (2026): Fitment-First Picks
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A worn spark plug rarely announces itself. It shows up as a rough idle at a stoplight, a stumble under throttle, a check-engine light for a misfire on cylinder six, or fuel economy that quietly slips away over a year. By the time you feel it, the plugs have usually been past their service interval for a while.
This guide covers the ten best spark plugs you can buy right now, across iridium, platinum and OE-replacement designs, for everything from an LS-powered Silverado to a Camry to a Harley Twin Cam.
We compared the listed part number, electrode design, pack size and stated application. Customer ratings change and cannot establish fitment or a performance gain; use the vehicle maker’s specification and the plug maker’s application catalog.
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Fitment first: There is no single best spark plug for every engine. These ten Amazon-listed part numbers cover different applications; match the OE specification, heat range, reach, seat, gap and required quantity before ordering. A premium material alone does not promise more horsepower or fuel economy.
The List at a Glance
- Best Overall: NGK 6619 Iridium IX LFR6AIX-11 — fine-wire iridium, huge review base
- Best for GM V8 Trucks: NGK 3186 G-Power Platinum TR5GP — correct heat range for LS engines
- Best Direct-Fit for Silverado: NGK Iridium IX Silverado 1500 Set — application-matched eight-pack
- Best Budget: ACDelco 41-162 GM OE Iridium — factory plug, sold individually
- Best OEM Platinum Set: ACDelco 41-962 Professional Platinum — double platinum, full V8 set
- Highest Rated: Bosch 9614 OE Double Iridium — best score in this roundup
- Best Denso Value: Denso 4503 Platinum TT PK16TT — twin-tip design, six-pack
- Best for Toyota and Lexus: Denso 3297 SK20R11 Iridium Long Life — the factory plug for many Toyotas
- Best for V-Twin Motorcycles: NGK Iridium IX DCPR7EIX — Harley Twin Cam pair
- Best for Japanese Imports: NGK LKAR7BIX-11S Iridium IX — wide import application list
Spark Plug Comparison Table
1. NGK 6619 Iridium IX Spark Plugs LFR6AIX-11 (6 Pack)
NGK 6619 Iridium IX Spark Plugs LFR6AIX-11 (6 Pack) is an Amazon-listed option with iridium center, fine-wire tip. Match the exact application before comparing materials or price.
| Electrode | Iridium center, fine-wire tip |
| Series | Iridium IX (aftermarket performance line) |
| Pack size | 6 plugs |
| Typical service life | 40,000–50,000 miles per NGK’s Iridium IX guidance |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Iridium center, fine-wire tip
- Listed quantity: 6 plugs
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
NGK 6619 Iridium IX Spark Plugs LFR6AIX-11 (6 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
NGK 6619 Iridium IX Spark Plugs LFR6AIX-11 (6 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
The honest catch is service life, and it is one most roundups get wrong. NGK states plainly that Iridium IX plugs are designed to last 40,000 to 50,000 miles, while its OE Iridium (Laser) plugs are designed for 80,000 to 100,000. If you want to install plugs and forget them for a decade, an OE-spec iridium plug like the Denso SK20R11 is the better choice; Iridium IX trades interval for spark quality.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
2. NGK 3186 G-Power Platinum Spark Plugs TR5GP (8 Pack)
NGK 3186 G-Power Platinum Spark Plugs TR5GP (8 Pack) is an Amazon-listed option with platinum center. Match the exact application before comparing materials or price.
| Electrode | Platinum center |
| Series | G-Power Platinum |
| Part number | TR5GP (stock no. 3186) |
| Pack size | 8 plugs |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Platinum center
- Listed quantity: 8 plugs
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
NGK 3186 G-Power Platinum Spark Plugs TR5GP (8 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
NGK 3186 G-Power Platinum Spark Plugs TR5GP (8 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
What you are not getting is longevity. If your truck is a daily driver racking up highway miles, an iridium set like the direct-fit NGK Iridium IX Silverado kit or the ACDelco 41-962 platinum set will go longer between services. G-Power is the value option in the platinum tier, not the long-life option.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
3. NGK Iridium IX Spark Plugs for Chevrolet Silverado 1500 5.3L / 6.2L V8 2014–2024 (8 Pack)
NGK Iridium IX Spark Plugs for Chevrolet Silverado 1500 5.3L / 6.2L V8 2014–2024 (8 Pack) is an Amazon-listed option with iridium center, fine-wire tip. Match the exact application before comparing materials or price.
| Electrode | Iridium center, fine-wire tip |
| Series | Iridium IX |
| Application | Silverado 1500 5.3L and 6.2L V8, 2014–2024 |
| Pack size | 8 plugs |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Iridium center, fine-wire tip
- Listed quantity: 8 plugs
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
NGK Iridium IX Spark Plugs for Chevrolet Silverado 1500 5.3L / 6.2L V8 2014–2024 (8 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
Underneath the application packaging it is standard NGK Iridium IX — the same fine-wire iridium centre electrode as the LFR6AIX-11 above, in the correct configuration for a late-model Silverado 1500. For an owner who wants iridium and does not want to cross-reference part numbers, that is a fair trade.
NGK Iridium IX Spark Plugs for Chevrolet Silverado 1500 5.3L / 6.2L V8 2014–2024 (8 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
4. ACDelco GM Original Equipment 41-162 (19417055) Iridium Spark Plug
ACDelco GM Original Equipment 41-162 (19417055) Iridium Spark Plug is an Amazon-listed option with iridium center. Match the exact application before comparing materials or price.
| Electrode | Iridium center |
| Series | GM Original Equipment |
| Part numbers | 41-162 / 19417055 |
| Pack size | 1 plug |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Iridium center
- Listed quantity: 1 plug
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
ACDelco GM Original Equipment 41-162 (19417055) Iridium Spark Plug should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
ACDelco GM Original Equipment 41-162 (19417055) Iridium Spark Plug should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
ACDelco GM Original Equipment 41-162 (19417055) Iridium Spark Plug should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
5. ACDelco 41-962 Professional Platinum Spark Plug (8 Pack)
ACDelco 41-962 Professional Platinum Spark Plug (8 Pack) is an Amazon-listed option with double platinum. Match the exact application before comparing materials or price.
| Electrode | Double platinum |
| Series | ACDelco Professional |
| Pack size | 8 plugs |
| Factory gap | Ships pre-gapped; owners report roughly .043″, LS spec is .040″ |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Double platinum
- Listed quantity: 8 plugs
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
ACDelco 41-962 Professional Platinum Spark Plug (8 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
ACDelco 41-962 Professional Platinum Spark Plug (8 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
ACDelco 41-962 Professional Platinum Spark Plug (8 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
6. Bosch 9614 OE Fine Wire Double Iridium Spark Plug (4 Pack)
Bosch 9614 OE Fine Wire Double Iridium Spark Plug (4 Pack) is an Amazon-listed option with double iridium, fine wire. Match the exact application before comparing materials or price.
| Electrode | Double iridium, fine wire |
| Series | Bosch OE Fine Wire |
| Manufacturer claim | Up to 4X the life of a standard plug |
| Pack size | 4 plugs |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Double iridium, fine wire
- Listed quantity: 4 plugs
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
Bosch 9614 OE Fine Wire Double Iridium Spark Plug (4 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
Bosch 9614 OE Fine Wire Double Iridium Spark Plug (4 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
Bosch 9614 OE Fine Wire Double Iridium Spark Plug (4 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
7. Denso 4503 Platinum TT Spark Plugs PK16TT (6 Pack)
Denso 4503 Platinum TT Spark Plugs PK16TT (6 Pack) is an Amazon-listed option with platinum, twin-tip design. Match the exact application before comparing materials or price.
| Electrode | Platinum, twin-tip design |
| Series | Denso Platinum TT |
| Part number | PK16TT (stock no. 4503) |
| Pack size | 6 plugs |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Platinum, twin-tip design
- Listed quantity: 6 plugs
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
Denso 4503 Platinum TT Spark Plugs PK16TT (6 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
Denso 4503 Platinum TT Spark Plugs PK16TT (6 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
Where it falls short is the same place every platinum plug does. Denso’s own iridium long-life plugs go substantially further between changes, and forum discussion increasingly points buyers toward the Iridium TT line as the successor to this one. If your engine calls for a long-interval iridium plug, the SK20R11 below is the more appropriate Denso; the PK16TT is the value choice, not the long-life one.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
8. Denso 3297 SK20R11 Iridium Long Life Spark Plugs (4 Pack)
Denso 3297 SK20R11 Iridium Long Life Spark Plugs (4 Pack) is an Amazon-listed option with iridium center, platinum ground pad. Match the exact application before comparing materials or price.
| Electrode | Iridium center, platinum ground pad |
| Series | Denso Iridium Long Life |
| Part number | SK20R11 (stock no. 3297) |
| Pack size | 4 plugs |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Iridium center, platinum ground pad
- Listed quantity: 4 plugs
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
Denso 3297 SK20R11 Iridium Long Life Spark Plugs (4 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
Denso 3297 SK20R11 Iridium Long Life Spark Plugs (4 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
Denso 3297 SK20R11 Iridium Long Life Spark Plugs (4 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
9. NGK Iridium IX DCPR7EIX Spark Plugs for Harley-Davidson Twin Cam (Pair)
NGK Iridium IX DCPR7EIX Spark Plugs for Harley-Davidson Twin Cam (Pair) is an Amazon-listed option with iridium center, fine-wire tip. Match the exact application before comparing materials or price.
| Electrode | Iridium center, fine-wire tip |
| Series | Iridium IX |
| Application | 1999–2016 Harley-Davidson Twin Cam |
| Pack size | 2 plugs |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Iridium center, fine-wire tip
- Listed quantity: 2 plugs
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
NGK Iridium IX DCPR7EIX Spark Plugs for Harley-Davidson Twin Cam (Pair) should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
NGK Iridium IX DCPR7EIX Spark Plugs for Harley-Davidson Twin Cam (Pair) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
We compared the listed part number, electrode design, pack size and stated application. Customer ratings change and cannot establish fitment or a performance gain; use the vehicle maker’s specification and the plug maker’s application catalog.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
10. NGK LKAR7BIX-11S Iridium IX Spark Plug 93501 (4 Pack)
NGK LKAR7BIX-11S Iridium IX Spark Plug 93501 (4 Pack) is an Amazon-listed option with iridium center, fine-wire tip. Match the exact application before comparing materials or price.
| Electrode | Iridium center, fine-wire tip |
| Series | Iridium IX |
| Part number | LKAR7BIX-11S (stock no. 93501) |
| Applications | Select Acura, Honda, Infiniti, Lexus, Mazda, Nissan, Subaru, Toyota and other models, 2007–2025, varying by model |
| Fitment | Match OE part number, engine and gap |
✔ Pros
- Exact listed part number for application lookup
- Iridium center, fine-wire tip
- Listed quantity: Check listing quantity
✘ Cons
- Not a universal fit across engines or model years
- Confirm OE heat range, reach, seat, gap and required plug count
NGK LKAR7BIX-11S Iridium IX Spark Plug 93501 (4 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Electrode material and pack size are comparison points; they do not establish a horsepower or mileage gain.
We compared the listed part number, electrode design, pack size and stated application. Customer ratings change and cannot establish fitment or a performance gain; use the vehicle maker’s specification and the plug maker’s application catalog.
NGK LKAR7BIX-11S Iridium IX Spark Plug 93501 (4 Pack) should be evaluated against your vehicle maker’s spark-plug specification. Use an application catalog or OE part number to confirm heat range, thread, reach, seat, gap and quantity before ordering.
Who should buy it: Drivers whose exact engine application calls for this part number or a verified equivalent.
Amazon listing checked 9 October 2026; price and availability may change.
How We Picked These Spark Plugs
This is a research-based roundup. We did not put these plugs on an engine dyno, and a guide that claims dyno testing while linking to ten Amazon listings deserves your suspicion.
We compared the listed part number, electrode design, pack size and stated application. Customer ratings change and cannot establish fitment or a performance gain; use the vehicle maker’s specification and the plug maker’s application catalog.
Every specification was checked against the manufacturer’s own literature rather than repeated from other roundups, which is how the Iridium IX service-interval point in the buying guide surfaced.
We then read owner threads on BobIsTheOilGuy, SilveradoSierra, Ford-Trucks, ToyotaNation and the GM truck forums looking specifically for failure modes: gap drift, electrode damage during installation, fitment confusion and brand-specific history.
We also deliberately spread the list across manufacturers. NGK dominates the category by sales volume, and a roundup that simply followed the sales charts would have been eight NGK part numbers, which helps nobody choose. ACDelco, Denso and Bosch are here because each is the right answer for a particular engine, not for balance.
What to Look for in a Spark Plug
For a work truck, an OE-specified iridium plug can be worthwhile when its service interval and exact part number match the engine. NGK distinguishes single precious-metal Iridium IX from dual precious-metal OE Iridium; compare the vehicle maker’s specification before substituting. If the engine is worn or misfiring, diagnose the cause before expecting a plug swap to change mileage. See NGK’s part finder and NGK’s electrode comparison.
Get the part number right before anything else
Brand is the last decision, not the first. Heat range, thread reach and seat type are engine-specific, and a plug that is wrong in any of those will still thread in and run badly — or damage a piston. Read the number off the plug you are removing, or use your engine code rather than just the model name. A listing that names your exact year and engine removes most of this risk.
Copper, platinum or iridium
The material determines how long the plug holds its gap. Published figures put copper around 20,000–30,000 miles, platinum around 50,000–60,000 and iridium around 80,000–120,000. Copper still makes sense in older engines with a distributor and in some boosted applications; platinum suits modern coil-on-plug engines on a regular service schedule; iridium is for engines with long factory intervals and for anyone who would rather do the job once.
Iridium IX and OE Iridium are not the same thing
This is the distinction most guides skip. NGK’s Iridium IX is an aftermarket performance line with a single precious-metal fine-wire tip, designed to last 40,000–50,000 miles. Its OE Iridium (Laser) plugs use iridium on the center and platinum on the ground electrode, and are designed for 80,000–100,000. They perform similarly; they are built for different jobs. Choose IX for spark quality on a modified or high-demand engine, OE iridium for the long interval.
Single or double precious metal
A single platinum or iridium plug protects the center electrode only, and the ground strap keeps wearing. Double platinum and double iridium put precious metal on both surfaces, so the gap opens more slowly and stays closer to spec through the plug’s life. On a waste-spark or long-interval engine, that difference is worth paying attention to.
Check the gap — never assume it
Most plugs ship pre-gapped, but “pre-gapped” is not the same as “gapped for your engine,” and gaps drift in shipping. GM truck owners routinely find ACDelco 41-962 plugs arriving near .043″ when the LS specification is .040″. Measure each plug with a feeler gauge. If you must adjust, move the ground strap gently and never lever against the center electrode — fine-wire tips break easily and the damage is not always visible.
Pack size and torque
Match the pack to the cylinder count so you are not mixing a new plug with older ones, and torque each plug to the manufacturer’s specification. A loose plug in an aluminium head works its way out over time; an over-torqued one damages threads that are expensive to repair.
Common Mistakes to Avoid
- Replacing only the misfiring cylinder. All the plugs have the same mileage on them. Do the full set or you will be back under the hood shortly.
- Prying on the center electrode to set the gap. Fine-wire iridium and platinum tips snap or fracture invisibly. Move the ground strap instead.
- Skipping the torque wrench. Under-torqued plugs work loose and can blow out of an aluminium head; over-torqued ones strip threads. Both are far more expensive than the plugs.
- Assuming a longer-life plug is a better plug. If your engine is calibrated around a specific plug, an “upgrade” with the wrong heat range makes it run worse, not better.
- Ignoring what the old plugs are telling you. Oil fouling, heavy carbon or a melted electrode are symptoms of another problem. New plugs will mask it for a while, then fail the same way.
Spark Plug FAQs
How often should you replace spark plugs?
It depends entirely on the plug material and your engine’s service schedule. Copper plugs generally need changing around 20,000–30,000 miles, platinum around 50,000–60,000 and iridium around 80,000–120,000. Your owner’s manual interval takes precedence — it was written around the plug the engine was designed for.
Are iridium spark plugs worth it over platinum?
For most modern engines, yes — iridium roughly doubles the service interval and its harder, finer electrode holds the gap longer. The exception is an engine specified for platinum, where switching material without checking the heat range and design gains nothing and can create problems.
What is the difference between Iridium IX and Laser Iridium?
Iridium IX is NGK’s aftermarket performance plug with a single fine-wire iridium tip, designed for 40,000–50,000 miles. Laser (OE) Iridium adds platinum on the ground electrode and is designed for 80,000–100,000. They spark similarly; the OE plug simply lasts far longer.
Do spark plugs come pre-gapped?
Usually, but the pre-set gap is a nominal figure and can shift during shipping and handling. Owners regularly find plugs a few thousandths off the specification for their engine. Check every plug with a feeler gauge before installation — it takes a couple of minutes and prevents a misfire.
Can you replace just one spark plug?
You can, but you should not. The remaining plugs carry the same mileage and wear, so a single new plug creates an uneven ignition across cylinders and the next failure is usually weeks away. Replace the full set together.
Do new spark plugs improve gas mileage or horsepower?
Only if the old ones were worn. Replacing degraded plugs restores the fuel economy and smoothness the engine had when healthy, which can feel like a gain. Fitting new plugs to an engine with good plugs already in it changes essentially nothing.
What are the signs of worn spark plugs?
Rough or unsteady idle, hesitation under acceleration, harder cold starts, a drop in fuel economy, and a misfire code for a specific cylinder. On removal, worn plugs show a rounded or eroded electrode and a visibly wider gap than specification.
The Verdict
For most drivers the NGK 6619 Iridium IX LFR6AIX-11 is the plug to buy: fine-wire iridium, a six-pack that suits a V6 exactly, and one of the deepest review records in the category. GM truck owners are better served by the NGK G-Power TR5GP eight-pack, which arrives in the correct heat range and the right quantity for an LS V8. Silverado 1500 owners can see our best spark plugs for Chevy Silverado 1500 guide.
If the priority is the longest possible interval rather than the sharpest spark, the Denso SK20R11 Iridium Long Life is the right choice — it is the factory plug for a great many Toyota engines and it is built for the factory service schedule. Whichever you pick, verify the part number against your engine, replace the full set, and check the gap before anything goes in.
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