The Mitsubishi 6G72 (SOHC 12V) is a 2,972 cc, V6 naturally aspirated petrol engine produced between 1986 and 1999. It features a single overhead camshaft per bank (SOHC), 12 valves total, and a cast‑iron block with aluminum cylinder heads. In standard form it delivered 103–125 kW (140–170 PS) with torque figures between 230–255 Nm, optimized for smooth highway cruising and light towing capability.
Fitted to models such as the Debonair, Galant VR — 4 (early), Pajero/Monte…
Production years 1986–1991 meet pre-Euro standards; 1992–1999 models meet Euro 1 depending on market (JAMA Type Approval #JAMA/EMS/1872).
The Mitsubishi 6G72 (SOHC 12V) is a 2,972 cc V6 naturally aspirated petrol engine engineered for luxury sedans and full-size SUVs (1986–1999). It combines SOHC 12-valve architecture with multi-point fuel injection to deliver smooth torque delivery and mechanical simplicity. Designed to meet pre-Euro and Euro 1 emissions standards, it prioritizes durability and serviceability over high performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,972 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | V6, SOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 82.0 mm | |
Power output | 103–125 kW (140–170 PS) @ 5,000–5,500 rpm | |
Torque | 230–255 Nm @ 4,000 rpm | |
Fuel system | Multi-point fuel injection (MPFI) | |
Emissions standard | Pre-Euro (1986–1991); Euro 1 (1992–1999) | |
Compression ratio | 8.9:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven SOHC (two belts) | |
Oil type | Mitsubishi Motors Genuine Oil 10W‑30 (API SG/CC) | |
Dry weight | 165 kg |
The Mitsubishi 6G72 (SOHC 12V) was used across Mitsubishi's V20/E38 platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations-reinforced mounts in the Pajero and revised intake manifolds in the Diamante-and from 1992 the facelifted Galant adopted updated coolant jackets, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
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The 6G72 (SOHC 12V)'s primary reliability risk is head gasket failure in high-mileage or thermally stressed units, with elevated incidence in off-road Pajero applications. Mitsubishi internal data cited in Engineering Report #MER‑6G72‑91 noted measurable coolant leakage at rear cylinder banks in engines exceeding 180,000 km without cooling maintenance, while JAMA field reports confirmed overheating as a leading cause of premature gasket degradation. Extended idling and coolant neglect increase thermal cycling stress, making cooling system integrity critical.
Analysis derived from Mitsubishi engineering reports (1991–1996) and JAMA failure statistics (1992–2000). Repair procedures should follow manufacturer guidelines.
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The 6G72 (SOHC 12V) is generally reliable when maintained properly, though pre-1992 models are prone to head gasket issues—especially in Pajero applications. Post-1992 revisions significantly improved cooling and sealing. Using correct 10W-30 oil and adhering to service intervals ensures longevity beyond 250,000 km.
Key issues include rear-bank head gasket failure (pre-1992), dual timing belt tensioner wear, intake manifold vacuum leaks, and distributor oil seal leaks. Most are linked to age, thermal stress, or neglected maintenance rather than fundamental design flaws.
The 6G72 (SOHC 12V) powered the Pajero/Montero (V20/V30, 1986–1999), Debonair (1986–1992), Diamante (1990–1995), and early Galant VR-4 base models (1987–1989). It was used exclusively by Mitsubishi and was not licensed to other manufacturers.
Limited potential. Mild gains (+8–12 kW) are possible via ECU remap and intake/exhaust upgrades, but the SOHC 12-valve head restricts airflow. Forced induction is not recommended due to stock internals and low compression ratio.
Typical for a 3.0L V6 of its era. In a Pajero 3.0 V6, expect ~13.5 L/100km (city) and ~9.8 L/100km (highway), or 21–29 mpg UK combined. Real-world mixed driving typically yields 24–27 mpg UK with conservative driving.
No. The 6G72 (SOHC 12V) is a non-interference engine. If either timing belt fails, the pistons will not contact the valves, preventing catastrophic damage—though the engine will stall and require belt replacement.
Mitsubishi specifies 10W-30 mineral or semi-synthetic oil meeting API SG/CC standards. Always use this grade to ensure proper lubrication of the SOHC valvetrain and hydraulic lifters.
Comprehensive technical documentation and regulatory references
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EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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