The 2018 Jeep Wrangler JL can certainly be described as “all-new,” but the 3.6-liter Pentastar V-6 is largely carry-over from the outgoing Wrangler JK. Still, it’s got a new fuel-saving feature: Auto Start/Stop. The system automatically turns the engine off when stopped at traffic lights or other similar driving scenarios. Like other start/stop systems, the engine restarts automatically when the brake pedal is released, giving the engine time to rev back to idle before the driver has time to press the throttle. The result is less overall fuel consumption.

As for the rest of the Pentastar, the engine retains its 60-degree V shape; its aluminum, deep-skirt block; aluminum alloy heads; its chain-driven, dual-overhead camshafts with four valves per cylinder; its 11.3:1 compression ratio; and its multiport fuel injection. The horsepower and torque specs also remain unchanged at 285 horsepower at 6,400 rpm and 260 pound-feet of torque at 4,800 rpm.

The V-6 can be paired with both the six-speed manual transmission or the eight-speed automatic – both of which are new to the Wrangler for 2018. Towing remains the same, too. The Wrangler two-door can pull 2,000 pounds while the Wrangler Unlimited, the four-door model, will pull 3,500 pounds.

As for that all-important fuel economy, Jeep says the V-6 will get 18 mpg city, 23 mpg highway, and 20 mpg combined with the automatic transmission and 17 mpg city, 23 mpg highway, and 19 mpg combined with the manual gearbox. That’s a marked improvement over the 16/20 mpg with the manual-equipped JK and 16/21 mpg with the JK’s old five-speed automatic.

Continue reading for detailed specs of the 3.6-liter Pentastar V-6.

2018 Jeep Wrangler 3.6-liter Pentastar V-6 Specifications Exterior Wallpaper quality
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3.6-­LITER PENTASTAR V-­6 - Drivetrain Specifications

Availability Standard — all models
Type and Description 60-­degree, V-­type, liquid-­cooled
Displacement (cu. in. / cc) 220 cu. in. (3604 cu. cm)
Bore x Stroke 3.78 x 3.27 (96 x 83)
Valve System Chain-­driven DOHC, 24 valves and hydraulic end-­pivot roller rockers
Fuel Injection Sequential, multiport, electronic, returnless
Construction Aluminum deep-­skirt block, aluminum alloy heads
Compression Ratio 10.2:1
Power 285 HP @ 6,400 RPM
Torque 260 LB-FT @ 4,800 RPM
Max. Engine Speed (rpm) 6,600 rpm (electronically limited)
Fuel Requirement Unleaded regular, 87 octane (R + M)/2
Fuel Tank Capacity (gallons) 22.5
Oil Capacity 6.0 quarts (5.7 liters)
Coolant Capacity 14 quarts (13.25 liters)
Emission Controls Dual three-­way catalytic converters, heated oxygen sensors and internal engine features
EPA Fuel Economy mpg (city/hwy/combined) 18/23/20 (automatic); 17/23/19 (manual)
Engine Assembly Plant Trenton South Engine Plant, Trenton, Mich.


2018 Jeep Wrangler

2018 Jeep Wrangler
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Read our full review on the 2018 Jeep Wrangler.

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