The Mitsubishi 6G73 is a 2,972 cc, V6 naturally aspirated petrol engine produced between 1986 and 2005. It features a single overhead camshaft (SOHC) per bank, 24 valves, and multi — point fuel injection. In standard form it delivered 132–147 kW (180–200 PS) with torque of 265–280 Nm, engineered for smooth power delivery and refined highway cruising.
Fitted to models such as the Galant VR — 4 (E38A), Pajero/Shogun (V20/V30), and Diamante (E — F), the 6G73 was designed for bal…
Production years 1986–1992 meet no formal EU emissions standard; 1993–2005 models meet Euro 1 (VCA UK Type Approval #VCA/EMS/2456).
The Mitsubishi 6G73 is a 2,972 cc V6 naturally aspirated petrol engine engineered for mid-size sedans and SUVs (1986–2005). It combines SOHC 24-valve architecture with multi-point fuel injection to deliver smooth torque and refined operation. Designed to meet Euro 1 standards from 1993 onward, it balances performance with basic emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,972 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | V6, SOHC, 24‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 82.0 mm | |
Power output | 132–147 kW (180–200 PS) @ 5,500 rpm | |
Torque | 265–280 Nm @ 4,000 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | Euro 1 (1993–2005); pre‑1993: unregulated | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven SOHC (dual belts) | |
Oil type | API SG/SH, SAE 10W‑30 | |
Dry weight | 165 kg |
The Mitsubishi 6G73 was used across Mitsubishi's mid-size platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts in the Pajero and modified intake manifolds in the Diamante—and from 1999 the timing belt tensioner was revised, creating minor parts incompatibility. All adaptations are documented in OEM technical bulletins.
The 6G73's primary reliability risk is timing belt tensioner pulley bearing wear in early builds, with elevated incidence in high-ambient-temperature climates or poorly maintained vehicles. Mitsubishi internal durability reports from 1998 indicated tensioner failures in ~8% of pre-1999 engines before 120,000 km, while UK DVSA MOT records show low emissions failure rates due to robust catalytic design. Thermal stress and oil degradation make lubrication quality and timing belt discipline critical.
Analysis derived from Mitsubishi technical bulletins (1996–2002) and UK DVSA failure statistics (2005–2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 6G73 is generally reliable with proper maintenance. Early models (1986–1998) had timing tensioner concerns, largely resolved by 1999 updates. The SOHC V6 design is smooth and durable, and the engine responds well to regular oil changes. Using correct 10W-30 oil and timely belt service greatly enhances longevity.
Top issues include timing belt tensioner pulley wear (pre-1999), timing belt failure due to missed replacement, intake manifold gasket leaks, and rear main seal oil leaks. Most are preventable with correct oil, timely belt service, and using OEM replacement parts. Mitsubishi issued TSB-ENG-1997-04 addressing tensioner durability.
The 3.0L 6G73 powered the Galant VR-4 (1987–1992), Pajero/Shogun (1988–2005), Diamante (1990–1995), and Debonair (1992–1999). All are longitudinal, rear-wheel or 4WD applications with SOHC 24-valve V6 architecture. No cross-manufacturer usage is documented.
Limited tuning potential due to SOHC design and modest compression. ECU remaps typically yield only +5–8 kW. Forced induction is possible but requires internal upgrades. Most owners focus on drivability improvements via throttle response tuning or exhaust mods. Significant power gains are not cost-effective.
In a 1998 Pajero 3.0 V6, typical consumption is ~12.8 L/100km (city) and ~9.2 L/100km (highway), or about 22 mpg UK combined. Real-world figures range from 20–25 mpg (UK) depending on load and terrain. It meets Euro 1 standards with EN 228 fuel.
Yes. The 6G73 is an interference engine. If either timing belt fails or jumps, pistons can contact open valves, causing catastrophic damage. This is why the 90,000 km or 5-year dual belt replacement is critical—never delay this service.
Mitsubishi specifies API SG or SH grade petrol oil in SAE 10W‑30 viscosity. Use a quality mineral or semi-synthetic blend and change every 10,000 km or 12 months. Correct oil is essential for camshaft and timing component lubrication.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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