The Mitsubishi 4J12 is a 2,360 cc, inline‑four naturally aspirated petrol engine produced between 2010 and 2023. It features a double overhead camshaft (DOHC), 16 valves, and Mitsubishi’s MIVEC variable valve timing on the intake camshaft only. In standard form it delivered 125–128 kW (170–174 PS) with torque between 222–226 Nm, offering smooth mid‑range response for midsize SUVs and crossovers.
Fitted to models such as the Outlander (ZJ/ZK), ASX / RVR (GA/GG), and Ecl…
Production years 2010–2014 meet Euro 5 standards; 2015–2023 models meet Euro 6 depending on market (Japan Automobile Manufacturers Association Type Approval #JAMA/4J12/2015).
The Mitsubishi 4J12 is a 2,360 cc inline‑four naturally aspirated petrol engine engineered for midsize SUVs and crossovers (2010–2023). It combines DOHC architecture with intake-only MIVEC variable valve timing to deliver smooth mid‑range torque and improved fuel efficiency. Designed to meet Euro 5 (and later Euro 6) standards, it balances refinement with everyday usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,360 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 88.0 mm × 97.0 mm | |
Power output | 125–128 kW (170–174 PS) | |
Torque | 222–226 Nm @ 4,100 rpm | |
Fuel system | Sequential multi‑point fuel injection (SFI) | |
Emissions standard | Euro 5 (2010–2014); Euro 6 (2015–2023) | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain (front‑mounted, maintenance‑free design) | |
Oil type | Mitsubishi Genuine 0W‑20 (API SN/ILSAC GF‑5) | |
Dry weight | 132 kg |
The Mitsubishi 4J12 was used across Mitsubishi's ZJ/GA/GN platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts in the Outlander and simplified MIVEC calibration in the ASX—and from 2015 the facelifted Eclipse Cross models adopted updated emissions hardware, creating minor ECU interchange limits. All adaptations are documented in OEM technical bulletins.
The 4J12's primary reliability risk is MIVEC solenoid failure in early Outlander and high-mileage ASX units, with elevated incidence in hot climates and track use. Mitsubishi internal field data (2016) indicated ~14% of 2010–2013 Outlander units required solenoid replacement before 100,000 km, while EU service networks reported increased MIVEC-related DTCs in vehicles using non-spec oil. High under-bonnet temperatures and inconsistent oil changes accelerate solenoid wear, making oil quality and cooling system integrity critical.
Analysis derived from Mitsubishi technical bulletins (2013–2022) and EU national vehicle inspection data (2018–2023). Repair procedures should follow manufacturer guidelines.
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Yes, with proper maintenance. The 4J12 is robust and non-interference, with strong internals. Early Outlander models (2010–2013) had MIVEC solenoid issues, resolved by 2014. Regular oil changes with 0W-20 API SN oil and avoiding excessive idling ensure longevity beyond 250,000 km.
MIVEC solenoid failure (early Outlander), oil consumption in high-mileage engines, carbon buildup on intake valves, and rare timing tensioner wear. Most issues are preventable with correct oil and service intervals. Documented in Mitsubishi TSBs ENG‑13‑009 and ECU‑15‑002.
The 4J12 powered the Outlander (2012–2023), ASX/RVR (2010–2021), Eclipse Cross (2017–2023), and Grand Lancer (2017–2023). All are 2.4L petrol variants. Note: it replaces the 4B12 in most applications. No cross-manufacturer licensing occurred.
Limited potential. The naturally aspirated design restricts airflow; bolt-on cams, headers, and ECU remaps can yield +10–15 kW. The block is strong, but head gasket and fuel system upgrades are recommended beyond 140 kW. Tuning should use 95 RON fuel and retain MIVEC functionality for drivability.
In an Outlander 2.4L (125 kW), expect ~9.8 L/100km city and ~6.9 L/100km highway, or ~34 mpg UK combined. ASX models average 9.2 L/100km due to lighter weight. Real-world mixed driving typically yields 32–38 mpg UK. Economy suffers if MIVEC is disabled or carbon buildup occurs.
No. The 4J12 is a non-interference engine. If the timing chain fails, pistons will not contact valves, preventing catastrophic internal damage. This enhances long-term reliability, though timing components should still be inspected at high mileage.
Mitsubishi specifies 0W-20 synthetic oil meeting API SN or ILSAC GF-5 standards. ACEA A5/B5 is acceptable. Change every 15,000 km or 12 months. Correct oil is critical for MIVEC solenoid function and preventing sludge in high-heat applications.
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