3.0L I6 Hurricane SO Twin Turbo ESS: Specs, HP, MPG 2026
The 3.0L I6 Hurricane SO Twin Turbo ESS is the standard-output version of Stellantis’ twin-turbo inline-six, and it makes 420 hp and 469 lb-ft in the Ram 1500. It runs on 87 octane, uses stop-start (the “ESS” in the name), and has no dipstick. This page covers the specs, how it differs from the High Output (HO) engine, fuel, oil, mpg and towing.
Hurricane SO Twin Turbo ESS: Quick Answer
| Spec | Hurricane SO (standard output) |
|---|---|
| Layout | 3.0L inline-six (2,993 cc), DOHC, 24 valves, aluminum block and head |
| Induction | Twin turbochargers, each feeding three cylinders |
| Power | 420 hp |
| Torque | 469 lb-ft (468 lb-ft in some applications) |
| Compression ratio | 10.4:1 |
| Peak boost | 22.4 psi |
| Max engine speed | 5,800 rpm |
| Fuel | 87 octane regular is acceptable; 91 or higher gives optimal performance |
| Engine oil | SAE 0W-20 full synthetic, 7.5 quarts (7.1 L) |
| Stop-start | Yes (ESS), starter-motor driven |
Hurricane SO Twin Turbo ESS at a Glance
3.0L twin-turbo inline-six, Ram 1500 ratings. Standard output versus high output.
SO vs HO in the Ram 1500
Bars are scaled to the HO value in each pair.
Key numbers
Which fuel does it need?
- EPA lists regular gasoline
- 91+ gives optimal performance
- EPA lists premium gasoline
- No E85 on either engine
Common mix-ups
How to read your engine in 3 steps
- 1Find the engine line. It is on the window sticker or build sheet.
- 2Look for SO or HO. SO means standard output, HO means high output.
- 3Match the fuel. SO runs on 87 or better, HO needs 91 or better.
What Does “3.0L I6 Hurricane SO Twin Turbo ESS” Mean?
The string is how Ram and Stellantis describe this engine on spec sheets and dealer listings. Each part has a plain meaning:
- 3.0L I6: a 3.0-liter inline six-cylinder engine.
- Hurricane: the engine family name. Stellantis also calls it the GME-T6.
- SO: Standard Output, the lower of the two power levels. The other is HO, High Output.
- Twin Turbo: two turbochargers.
- ESS: Engine Stop-Start, the system that shuts the engine off at a stop and restarts it when you lift off the brake.
You may also see it written “with stop/start”. It is the same engine.
Hurricane SO vs HO: What Is Different?
Both engines share the same 2,993 cc block design, so the differences come from boost, pistons, fuel delivery and fuel grade.
| Spec | Hurricane SO | Hurricane HO |
|---|---|---|
| Power in the Ram 1500 | 420 hp | 540 hp |
| Torque in the Ram 1500 | 469 lb-ft | 521 lb-ft |
| Compression ratio | 10.4:1 | 9.5:1 |
| Peak boost | 22.4 psi | 26 psi |
| Max engine speed | 5,800 rpm | 6,100 rpm |
| Pistons | Die-cast aluminum | Forged aluminum |
| High-pressure fuel pumps | One | Two |
| Charge cooler coolant inlets | One | Two |
| Fuel | 87 octane acceptable, 91+ optimal | 91 octane required |
| Engine oil | 0W-20 | 0W-40 |
| Oil capacity | 7.5 quarts | 7.5 quarts |
Both versions use the same deep-skirt aluminum block, cross-bolted steel main bearing caps, plasma transfer wire arc (PTWA) cylinder coating instead of iron liners, and direct injection at 350 bar (5,075 psi).
Both also have six piston-cooling jets and an electric coolant pump that keeps circulating after shutdown to protect the turbochargers. Cooled EGR is fitted to the SO only.
Which Vehicles Use the Hurricane SO?
The SO is the base Hurricane in three Stellantis lines:
- Ram 1500: from the 2025 model year, replacing the 5.7L Hemi V8 as the main gas engine. The Hemi returned as an option for 2026.
- Jeep Wagoneer and Grand Wagoneer: since 2022.
- Dodge Charger Sixpack: since 2025.
Does the Hurricane SO Need Premium Gas?
No. The Ram owner’s manual describes the SO as designed for regular 87 octane, and the EPA lists regular gasoline for it. The manual adds that 91 octane or higher lets the engine perform at its best, which matters most in hot weather or when towing.
The High Output engine is different. Its manual calls for 91 octane or higher, and the EPA lists premium for it. Neither engine should run on E85 or on ethanol blends above 15%.
Hurricane SO Fuel Economy vs the 5.7L Hemi
EPA ratings for the 2026 Ram 1500 show the SO ahead of the Hemi on every line:
| 2026 Ram 1500 engine | City / Hwy / Combined (mpg) |
|---|---|
| 3.0L Hurricane SO, 2WD | 18 / 25 / 21 |
| 3.0L Hurricane SO, 4WD | 18 / 24 / 20 |
| 5.7L Hemi V8, 2WD | 17 / 22 / 19 |
| 5.7L Hemi V8, 4WD | 16 / 20 / 18 |
| 3.0L Hurricane HO, 4WD | 15 / 21 / 17 |
Real-world numbers move with load. Under boost, especially while towing, the engine uses noticeably more fuel than the EPA cycle suggests. MotorTrend’s comparison test of the two Ram engines ranked the Hurricane first and the Hemi second.
Hurricane SO Towing and Payload
Ram’s maximum figures for the 2026 Ram 1500 are 11,610 lbs towing and 1,930 lbs payload with the Hurricane SO. The HO is rated lower, at 10,000 lbs towing and 1,490 lbs payload, and the 5.7L Hemi is rated at 11,320 lbs towing.
These are maximums “when properly equipped”, so your truck’s cab, axle ratio, drivetrain and options will set the real limit. Check the door-jamb sticker and Ram’s towing guide for your configuration.
For model-year ratings and other engines, see our Ram 1500 towing capacity guide and the Ram payload capacity chart.
Hurricane SO vs Ford 3.5L EcoBoost
The 3.5L EcoBoost V6 is the engine most buyers cross-shop. Ford lists the 2026 F-150’s standard 3.5L EcoBoost at 382 hp and 500 lb-ft. Its 13,500-lb maximum tow rating needs the Tow/Haul package and the Max Tow axle, and its maximum payload is 2,440 lbs.
| Rating | Ram 1500 Hurricane SO | F-150 3.5L EcoBoost |
|---|---|---|
| Horsepower | 420 | 382 |
| Torque (lb-ft) | 469 | 500 |
| Max towing (lbs) | 11,610 | 13,500 |
| Max payload (lbs) | 1,930 | 2,440 |
The Ram makes more horsepower, while the Ford has more torque and higher maximum ratings. Both are best-case figures that depend on configuration. If you are weighing reliability, our 3.5 EcoBoost problems guide covers the Ford side.
Oil, Capacity and the “No Dipstick” Design
The Hurricane SO takes SAE 0W-20 full synthetic oil, and the capacity is 7.5 quarts (7.1 L). The HO takes 0W-40.
There is no dipstick. An ultrasonic-style sensor mounted in the bottom of the oil pan measures oil level and temperature, and the result shows on the truck’s display. The sensor reads level only. It cannot measure oil life, which the truck estimates from operating conditions, and it cannot detect coolant in the oil.
Owners can run the “Oil Level Refresh Procedure” from the owner’s manual. If the sensor fails, the truck can still be driven and the instrument cluster shows a message.
For the Hemi’s oil specs, see our 5.7 Hemi oil type and capacity guide.
Reliability: What We Know So Far
The Hurricane is a young engine, so long-term data is thin. Early owner reports are mixed, and some of the loudest claims online are anecdotes rather than verified numbers. Two design points are worth knowing.
The engine uses direct injection only, so there is no port injector washing the intake valves, and deposits are a known long-term concern on direct-injection engines in general. The twin-turbo layout also adds heat and boost stress compared with the naturally aspirated Hemi, which is why regular oil changes matter.
Our Hurricane engine problems guide tracks reported failure points and what to check. If you are comparing engines before you buy, our best Ram 1500 engine guide lays out the options.
Hurricane SO FAQ
What does ESS mean on the Hurricane engine?
ESS means Engine Stop-Start. The engine shuts off at a stop and restarts automatically. Both the SO and the HO use a starter-motor-driven stop-start system.
How much horsepower does the Hurricane SO make?
The Hurricane SO makes 420 hp and 469 lb-ft of torque in the Ram 1500. Some applications list 468 lb-ft.
What is the difference between Hurricane SO and HO?
The HO runs more boost (26 psi vs 22.4 psi), lower compression, forged pistons and two fuel pumps, and it requires 91 octane. In the Ram 1500 it makes 540 hp against 420 hp for the SO.
What octane does the Hurricane SO use?
The SO is designed for 87 octane regular, and the EPA lists regular fuel. Using 91 octane or higher lets it perform at its best, mainly in heat or under load. The HO requires 91.
Is the Hurricane engine naturally aspirated?
No. Every Hurricane engine is twin-turbocharged. The 3.0L inline-six uses two turbos, each feeding three cylinders.
Does the Hurricane engine have a dipstick?
No. Oil level is read by a sensor in the oil pan and shown on the truck’s display.
How much oil does the Hurricane SO take?
It takes 7.5 quarts (7.1 L) of SAE 0W-20 full synthetic oil.
Does Dodge make an inline-six gas engine?
Yes. The Hurricane is a 3.0L twin-turbo inline-six used in the Dodge Charger Sixpack, the Ram 1500 and the Jeep Wagoneer lineup.
Is the Hurricane SO good for towing?
It is rated up to 11,610 lbs in the 2026 Ram 1500, slightly above the 5.7L Hemi’s 11,320 lbs. Real towing economy drops under sustained boost, so plan fuel stops accordingly.
Does the Hurricane SO get better mpg than the Hemi?
On EPA ratings, yes: 21 mpg combined for the 2WD SO against 19 mpg for the 2WD Hemi.
Related Guides
- Hurricane engine problems
- Best Ram 1500 engine
- Ram 1500 towing capacity
- Ram payload capacity chart
- 5.7 Hemi engine specs
- 5.7 Hemi oil type and capacity
- Ram 1500 years to avoid
- 3.5 EcoBoost problems
Last updated: October 8, 2026. Ratings vary by model year, trim and configuration, so your door-jamb sticker and owner’s manual always take priority.
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