The Isuzu MU-X RF20, specifically the 3.0d (177 Hp) 4×4 variant, represents a significant iteration of Isuzu’s mid-size SUV, receiving a substantial facelift in February 2017 and continuing in production through October 2020. Positioned as a body-on-frame SUV, the MU-X aimed to provide a robust and capable vehicle for families and those requiring off-road capability, primarily targeting markets outside of North America. This particular engine and drivetrain combination occupied a middle ground within the MU-X lineup, offering a balance between performance, fuel economy, and affordability. It served as a popular choice for buyers seeking a versatile SUV with genuine four-wheel drive capability.
Technical Specifications
| Brand | Isuzu |
| Model | MU-X |
| Generation | MU-X (RF20) (facelift 2017) |
| Type (Engine) | 3.0d (177 Hp) 4×4 |
| Start of production | February, 2017 |
| End of production | October, 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7 |
| Doors | 5 |
| Fuel consumption (urban) | 9.5-9.6 l/100 km (24.8 – 24.5 US mpg) |
| Fuel consumption (extra urban) | 6.8-7.0 l/100 km (34.6 – 33.6 US mpg) |
| Fuel consumption (combined) | 7.9 l/100 km (29.8 US mpg) |
| CO2 emissions | 208-209 g/km |
| Fuel Type | Diesel |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 12 kg/Hp |
| Weight-to-torque ratio | 4.9 kg/Nm |
| Power | 177 Hp @ 3600 rpm |
| Torque | 430 Nm @ 2000-2200 rpm (317.15 lb.-ft. @ 2000-2200 rpm) |
| Engine Model/Code | 4JJ1-TC |
| Engine displacement | 2999 cm3 (183.01 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 95.4 mm (3.76 in.) |
| Piston Stroke | 104.9 mm (4.13 in.) |
| Compression ratio | 16.3:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.9 l (7.29 US qt | 6.07 UK qt) |
| Coolant capacity | 11.1 l (11.73 US qt | 9.77 UK qt) |
| Kerb Weight | 2122-2142 kg (4678.21 – 4722.3 lbs.) |
| Max. weight | 2750 kg (6062.71 lbs.) |
| Max load | 608-628 kg (1340.41 – 1384.5 lbs.) |
| Trunk (boot) space – minimum | 235 l (8.3 cu. ft.) |
| Trunk (boot) space – maximum | 1830 l (64.63 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| Permitted trailer load with brakes (12%) | 3000 kg (6613.87 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4825 mm (189.96 in.) |
| Width | 1860 mm (73.23 in.) |
| Height | 1860 mm (73.23 in.) |
| Wheelbase | 2845 mm (112.01 in.) |
| Front track | 1570 mm (61.81 in.) |
| Rear (Back) track | 1570 mm (61.81 in.) |
| Front overhang | 905 mm (35.63 in.) |
| Rear overhang | 1075 mm (42.32 in.) |
| Ride height (ground clearance) | 230 mm (9.06 in.) |
| Minimum turning circle (turning diameter) | 11.6 m (38.06 ft.) |
| Approach angle | 24.0° |
| Departure angle | 25.1° |
| Ramp-over (brakeover) angle | 19.5° |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/70 R16; 255/60 R18 |
| Wheel rims size | 7J x 16; 7J x 18 |
Powertrain & Engine Architecture
The heart of the MU-X 3.0d 4×4 is the Isuzu 4JJ1-TC 3.0-liter inline-four diesel engine. This engine is a robust and well-regarded unit known for its durability and relatively simple construction. The ‘TC’ designation indicates the presence of a turbocharger and intercooler, enhancing power output. The 4JJ1 utilizes a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine features a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, contributing to efficient gas exchange. A compression ratio of 16.3:1 further aids in maximizing energy extraction from the fuel. The engine produces 177 horsepower at 3600 rpm and a substantial 430 Nm (317.15 lb-ft) of torque between 2000-2200 rpm. The manual transmission offered with this variant is a six-speed unit, chosen for its durability and ability to handle the engine’s torque output.
Driving Characteristics
The MU-X 3.0d 4×4 with a manual transmission delivers a driving experience focused on practicality and capability rather than outright performance. The engine’s torque peak, available at relatively low engine speeds, provides ample pulling power for towing and off-road driving. While not exceptionally quick, the MU-X offers sufficient acceleration for everyday driving situations. The six-speed manual transmission allows for precise control over gear selection, enabling drivers to optimize engine performance for various conditions. Compared to higher-output versions of the MU-X, this variant feels less strained during heavy loads or uphill climbs. However, it lacks the brisk acceleration of those models. The manual transmission provides a more engaging driving experience than an automatic, but requires more driver involvement.
Equipment & Trim Levels
The MU-X 3.0d 4×4 typically came equipped with a reasonable level of standard features. These generally included air conditioning, power windows and locks, a basic audio system, and alloy wheels. Safety features such as ABS (Anti-lock Braking System) were standard. Higher trim levels offered upgrades such as a more sophisticated infotainment system with touchscreen display, leather upholstery, automatic climate control, and parking sensors. Optional extras could include a sunroof, roof rails, and upgraded audio systems. The interior design was functional and durable, prioritizing practicality over luxury.
Chassis & Braking
The MU-X utilizes a traditional body-on-frame construction, providing a robust and durable chassis. The front suspension consists of a double wishbone setup, while the rear employs an independent multi-link suspension. This configuration aims to balance ride comfort with off-road capability. Braking duties are handled by ventilated discs at the front and solid discs at the rear. The braking system is adequate for the vehicle’s weight and intended use, but doesn’t offer the stopping power of more performance-oriented SUVs. The MU-X’s high ground clearance (230mm) and capable four-wheel drive system contribute to its off-road prowess.
Market Reception & Comparison
The Isuzu MU-X 3.0d 4×4 was generally well-received in markets where it was sold, particularly in Australia, Thailand, and parts of Asia and South America. Critics praised its robust construction, spacious interior, and genuine off-road capability. Fuel economy was considered reasonable for a vehicle of its size and type, averaging around 7.9 l/100 km (29.8 US mpg). Compared to other trims in the MU-X lineup, this variant offered a good balance between price and performance. It was often seen as a more sensible choice than the higher-output models for buyers who didn’t require maximum power. It competed with vehicles like the Toyota Fortuner, Mitsubishi Pajero Sport, and Ford Everest.
Legacy
The Isuzu 4JJ1-TC engine has proven to be a remarkably durable and reliable powertrain. The MU-X 3.0d 4×4, particularly the manual transmission versions, have developed a reputation for longevity and relatively low maintenance costs. In the used car market, these vehicles continue to hold their value reasonably well, especially those that have been well-maintained. While not known for cutting-edge technology, the MU-X remains a popular choice for buyers seeking a dependable and capable SUV for family use or off-road adventures. Its simple design and robust construction contribute to its continued appeal.
