The Isuzu MU-X RF20, specifically the 3.0d (177 Hp) Automatic variant produced from February 2017 to October 2020, represents a significant iteration of Isuzu’s mid-size SUV offering. This facelifted version of the second-generation MU-X (introduced in 2013) aimed to enhance both aesthetics and functionality, primarily targeting the Australian, Thai, and broader Asia-Pacific markets. Positioned as a robust, body-on-frame SUV, the MU-X competed with vehicles like the Toyota Fortuner, Mitsubishi Pajero Sport, and Ford Everest, offering seven-passenger seating and a focus on off-road capability combined with family-oriented practicality. The 3.0d Automatic trim served as a mid-range option, balancing performance with fuel efficiency and a more accessible price point compared to higher-spec models.
Technical Specifications
| Brand | Isuzu |
| Model | MU-X |
| Generation | MU-X (RF20) (facelift 2017) |
| Type (Engine) | 3.0d (177 Hp) Automatic |
| 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) | 9.8-9.9 l/100 km (24 – 23.8 US mpg) |
| Fuel consumption (extra urban) | 7.0-7.1 l/100 km (33.6 – 33.1 US mpg) |
| Fuel consumption (combined) | 8.0-8.1 l/100 km (29.4 – 29 US mpg) |
| CO2 emissions | 211-214 g/km |
| Fuel Type | Diesel |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 11.3 kg/Hp |
| Weight-to-torque ratio | 4.6 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 | 1992-2062 kg (4391.61 – 4545.93 lbs.) |
| Max. weight | 2650 kg (5842.25 lbs.) |
| Max load | 588-658 kg (1296.32 – 1450.64 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 | 1825-1860 mm (71.85 – 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) | 220-230 mm (8.66 – 9.06 in.) |
| Minimum turning circle (turning diameter) | 11.6 m (38.06 ft.) |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Gearbox | 6 gears, automatic transmission Rev-Tronic |
INTRODUCTION
The Isuzu MU-X RF20 3.0d Automatic, launched in 2017, was a key model in Isuzu’s strategy to capture a larger share of the growing mid-size SUV market, particularly in regions where robust, reliable, and capable vehicles are highly valued. The RF20 designation signifies the facelifted version of the MU-X, building upon the foundation laid by the original model introduced in 2013. This iteration featured styling updates, improved interior appointments, and refinements to the powertrain. Built on a traditional body-on-frame chassis, the MU-X prioritized durability and off-road performance, differentiating itself from the increasing number of car-based crossover SUVs. The 3.0d Automatic variant occupied a sweet spot in the lineup, offering a balance between the more affordable 2.5-liter models and the more powerful, but also more expensive, 3.0-liter variants with manual transmissions.
Powertrain & Engine Architecture
At the heart of the MU-X 3.0d Automatic lies the 4JJ1-TC 3.0-liter inline-four diesel engine. This engine is a cornerstone of Isuzu’s diesel technology, known for its durability and relatively simple design. The 4JJ1-TC utilizes a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A variable geometry turbocharger (VGT) and intercooler work in tandem to boost power and torque while managing exhaust gas temperatures. The engine produces 177 horsepower at 3600 rpm and a substantial 430 Nm (317.15 lb-ft) of torque between 2000 and 2200 rpm. This torque output is particularly important for towing and off-road driving. The engine features a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, contributing to efficient gas exchange. Paired with the engine is Isuzu’s “Rev-Tronic” six-speed automatic transmission. This transmission is designed for smooth shifting and responsive performance, with a focus on maximizing fuel efficiency. It doesn’t offer manual shift modes or paddle shifters.
Driving Characteristics
The MU-X 3.0d Automatic delivers a driving experience geared towards practicality and capability rather than outright sportiness. The automatic transmission provides smooth and predictable gear changes, making it well-suited for everyday driving and towing. While the 177 hp output isn’t particularly high by modern standards, the substantial 430 Nm of torque provides ample pulling power, especially at lower engine speeds. Compared to the manual transmission versions of the 3.0-liter engine, the automatic sacrifices a small degree of responsiveness, but gains in ease of use. The gear ratios are tuned for both on-road cruising and off-road crawling, providing a good balance between fuel economy and low-end grunt. The body-on-frame construction results in a more noticeable body roll compared to unibody SUVs, but also contributes to a robust and durable feel. The MU-X feels planted and stable, even when fully loaded or towing a trailer.
Equipment & Trim Levels
The 3.0d Automatic trim level of the MU-X RF20 typically included a range of standard features designed to enhance comfort and convenience. These generally included air conditioning, power windows and locks, a basic audio system with Bluetooth connectivity, and a multi-function steering wheel. Interior upholstery was typically cloth, although leather options were available as upgrades. Safety features included ABS brakes, electronic brakeforce distribution (EBD), and multiple airbags. Optional extras could include a touchscreen infotainment system with navigation, a reversing camera, parking sensors, and alloy wheels. Higher-spec versions of the MU-X offered additional features such as a sunroof, leather seats, and advanced driver-assistance systems.
Chassis & Braking
The MU-X RF20 utilizes a robust body-on-frame chassis, providing a solid foundation for both on-road and off-road driving. The front suspension consists of a double wishbone setup, while the rear features an independent multi-link suspension. This configuration aims to balance ride comfort with handling stability. Braking duties are handled by ventilated discs at the front and solid discs at the rear. The braking system is assisted by ABS (Anti-lock Braking System) and EBD (Electronic Brakeforce Distribution) to enhance safety and control. The MU-X’s relatively high ground clearance (220-230 mm) and approach/departure angles contribute to its off-road capability.
Market Reception & Comparison
The Isuzu MU-X 3.0d Automatic was generally well-received by automotive critics and consumers alike. It was praised for its robust build quality, comfortable ride, and strong towing capacity. However, some reviewers noted that the interior design was somewhat dated compared to newer competitors, and the engine, while capable, wasn’t the most refined in its class. Compared to the 2.5-liter MU-X variants, the 3.0d offered a significant performance boost, making it a more suitable choice for those who frequently tow or travel with a full load. Compared to the 3.0-liter manual versions, the automatic provided greater convenience and ease of use, albeit with a slight reduction in fuel economy. Fuel economy figures of 8.0-8.1 l/100 km (29.4 – 29 US mpg) were competitive within its segment.
Legacy
The Isuzu MU-X RF20 3.0d Automatic has proven to be a reliable and durable SUV, with many examples still in service today. The 4JJ1-TC engine is known for its longevity, provided it is properly maintained. On the used car market, these MU-Xs represent a good value proposition for buyers seeking a capable and affordable seven-seater. Common maintenance items include regular servicing of the engine, transmission, and suspension components. The MU-X’s body-on-frame construction and robust drivetrain make it well-suited for challenging conditions, and it remains a popular choice for families and adventurers alike.
