The Jeep Wrangler IV Unlimited (JL) Rubicon 3.0 EcoDiesel V6, produced from January 2018 to November 2022, represents a significant offering within the fourth generation (JL) of the iconic Wrangler. This variant combined the capability expected of a Rubicon with the fuel efficiency and torque characteristics of the 3.0-liter EcoDiesel engine, paired exclusively with an eight-speed automatic transmission. Positioned as a premium trim, it catered to buyers seeking a blend of off-road prowess and comfortable, long-distance driving. The JL generation marked a substantial evolution for the Wrangler, incorporating independent front suspension and a wider array of technology while retaining its core off-road DNA.
Technical Specifications
| Brand | Jeep |
| Model | Wrangler |
| Generation | Wrangler IV Unlimited (JL) |
| Type | Rubicon 3.0 EcoDiesel V6 (260 Hp) 4×4 Automatic |
| Start of production | January, 2018 |
| End of production | November, 2022 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Off-road vehicle |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 10.7 l/100 km (22 US mpg, 26.4 UK mpg, 9.3 km/l) |
| Fuel consumption (extra urban) | 8.1 l/100 km (29 US mpg, 34.9 UK mpg, 12.3 km/l) |
| Fuel consumption (combined) | 9.4 l/100 km (25 US mpg, 30.1 UK mpg, 10.6 km/l) |
| Fuel Type | Diesel |
| Weight-to-power ratio | 8.5 kg/Hp, 117.9 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 272.1 Nm/tonne |
| Power | 260 Hp @ 3600 rpm |
| Power per litre | 87 Hp/l |
| Torque | 600 Nm @ 1400-2800 rpm (442.54 lb.-ft. @ 1400-2800 rpm) |
| Maximum engine speed | 4600 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EXJ |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 16:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant capacity | 11.6 l (12.26 US qt | 10.21 UK qt) |
| Kerb Weight | 2205 kg (4861.19 lbs.) |
| Max. weight | 2765 kg (6095.78 lbs.) |
| Max load | 560 kg (1234.59 lbs.) |
| Trunk (boot) space – minimum | 548 l (19.35 cu. ft.) |
| Trunk (boot) space – maximum | 1059 l (37.4 cu. ft.) |
| Fuel tank capacity | 69 l (18.23 US gal | 15.18 UK gal) |
| Permitted trailer load with brakes (12%) | 1588 kg (3500.94 lbs.) |
| Length | 4785 mm (188.39 in.) |
| Width | 1875 mm (73.82 in.) |
| Height | 1868 mm (73.54 in.) |
| Wheelbase | 3008 mm (118.43 in.) |
| Front track | 1598 mm (62.91 in.) |
| Rear track | 1598 mm (62.91 in.) |
| Front overhang | 742 mm (29.21 in.) |
| Rear overhang | 1036 mm (40.79 in.) |
| Ride height (ground clearance) | 274 mm (10.79 in.) |
| Minimum turning circle | 12 m (39.37 ft.) |
| Approach angle | 43.9° |
| Departure angle | 37° |
| Ramp-over angle | 22.6° |
| Drivetrain Architecture | All wheel drive (4×4). ICE drives rear wheels, front wheels engaged via clutch. |
| Number of gears | 8 |
| Gearbox type | Automatic transmission |
| Front suspension | Coil spring, Rigid axle, Transverse stabilizer |
| Rear suspension | Rigid axle, Transverse stabilizer, Coil spring |
| Front brakes | Ventilated discs, 330×28 mm |
| Rear brakes | Disc, 342×14 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Electric |
| Tires size | 285/70 R17 |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
The heart of the Rubicon 3.0 EcoDiesel is the EXJ engine, a 3.0-liter turbocharged diesel V6. This engine utilizes a common-rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. The engine features a variable geometry turbocharger (VGT) and an intercooler to enhance power and efficiency. The DOHC (Double Overhead Camshaft) valvetrain, with four valves per cylinder, contributes to improved breathing and overall performance. The EcoDiesel engine is known for its robust low-end torque, making it ideally suited for off-road driving and towing. The eight-speed automatic transmission, sourced from ZF, provides smooth and efficient gear changes, and is specifically tuned for the diesel engine’s torque curve. This transmission offers a wide gear ratio spread, enhancing both on-road cruising and off-road crawling capabilities.
Driving Characteristics
The 3.0 EcoDiesel automatic combination in the Wrangler Rubicon delivers a unique driving experience. While not as quick as the gasoline-powered V6, the diesel provides a substantial 442 lb-ft of torque, readily available from 1400 rpm. This translates to effortless acceleration, particularly when off-roading or towing. The eight-speed automatic transmission helps to keep the engine in its optimal power band, providing responsive shifts. Compared to the manual transmission versions of the 3.0L diesel, the automatic offers greater convenience, especially in challenging terrain. The Rubicon’s off-road focused suspension and transfer case, combined with the diesel’s torque, make it a formidable off-road machine. On the road, the ride is generally comfortable, though the Wrangler’s inherent body-on-frame construction results in a less refined experience than unibody SUVs.
Equipment & Trim Levels
The Rubicon trim level, even with the diesel engine, came standard with a comprehensive suite of off-road equipment. This included heavy-duty Dana 44 axles, a Rock-Trac 4×4 transfer case with a 4:1 low-range gear ratio, electronic sway bar disconnect, and rock rails. Interior features typically included cloth or leather upholstery, a Uconnect infotainment system with a 7 or 8.4-inch touchscreen, and air conditioning. Optional extras included a premium audio system, heated seats, a navigation system, and various off-road accessories such as a winch and upgraded tires. The diesel Rubicon often included unique badging and interior trim elements to distinguish it from other Wrangler models.
Chassis & Braking
The Wrangler JL utilizes a body-on-frame construction, providing exceptional durability and off-road capability. The Rubicon trim features a specifically tuned suspension designed for extreme off-road conditions. The front suspension utilizes coil springs and a rigid axle with a transverse stabilizer bar, while the rear suspension also employs coil springs, a rigid axle, and a stabilizer bar. Braking duties are handled by ventilated discs at the front and discs at the rear. The anti-lock braking system (ABS) is standard, enhancing safety in various driving conditions. The Rubicon’s robust chassis and braking system are designed to withstand the stresses of off-road use and provide reliable stopping power.
Market Reception & Comparison
The Jeep Wrangler JL Rubicon 3.0 EcoDiesel received generally positive reviews. Critics praised its combination of off-road capability, fuel efficiency (achieving around 25 mpg combined), and comfortable ride. Compared to the gasoline-powered Wrangler models, the diesel offered superior fuel economy and torque, making it a popular choice for those who frequently tow or travel long distances. However, the diesel engine carried a higher price tag and potentially higher maintenance costs. Compared to the 3.6L V6, the diesel offered a more relaxed driving experience, particularly at highway speeds, due to its lower engine speed at a given velocity. The diesel Rubicon was often seen as a more refined and practical option for daily driving compared to the more hardcore gasoline-powered Rubicon trims.
Legacy
The 3.0 EcoDiesel engine in the JL Wrangler has proven to be a relatively reliable powertrain, though early models experienced some issues with emissions control systems, particularly the diesel particulate filter (DPF). Proper maintenance, including regular oil changes and DPF regeneration, is crucial for long-term reliability. On the used car market, the diesel Rubicon commands a premium price due to its desirable combination of features and capabilities. The JL generation Wrangler, and particularly the diesel Rubicon, has solidified the Wrangler’s position as the benchmark for off-road SUVs, and continues to be a popular choice among enthusiasts and adventurers.
