The Mitsubishi 4B10 is a 1,798 cc, inline‑four naturally aspirated petrol engine produced between 2007 and 2017. It features dual overhead camshafts (DOHC), 16 valves, and Mitsubishi’s MIVEC variable valve timing system on the intake camshaft. In standard form it delivered 103–110 kW (140–150 PS) with torque figures between 175–180 Nm, offering responsive urban performance and smooth highway cruising.
Fitted to models such as the Lancer (CY/CS), Outlander (CW), and ASX (GA), including the popular 1.8 L variants, the 4B10 was engineered for everyday drivability, fuel efficiency, and refinement. Emissions compliance was achieved through precise electronic throttle control, sequential multi‑point fuel injection, and exhaust after‑treatment systems, meeting Euro 4 standards initially and Euro 5 in later model years.
One documented concern is oil consumption in early production units (2007–2010), linked to piston ring design and cylinder wall finish. This issue was addressed in Mitsubishi Technical Service Bulletin TSB‑ME‑09‑001, which recommended revised piston assemblies for affected engines. From 2011 onward, updated ring packs and honing processes were implemented to improve oil control.
Production years 2007–2010 meet Euro 4 standards; 2011–2017 models meet Euro 5 compliance depending on market (JAMA Type Approval #JAMA/EMS/5678).
The Mitsubishi 4B10 is a 1,798 cc inline‑four naturally aspirated petrol engine engineered for compact and crossover SUVs (2007–2017). It combines MIVEC variable valve timing with sequential multi‑point fuel injection to deliver responsive low‑to‑mid range torque and smooth high‑rpm refinement. Designed to meet Euro 4 (early) and Euro 5 (later) standards, it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,798 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 86.0 mm × 77.0 mm | |
| Power output | 103–110 kW (140–150 PS) | |
| Torque | 175–180 Nm @ 4,250 rpm | |
| Fuel system | Sequential multi‑point fuel injection (SFI) | |
| Emissions standard | Euro 4 (2007–2010); Euro 5 (2011–2017) | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain (front‑mounted; low‑wear design) | |
| Oil type | Mitsubishi DiaQueen 5W‑30 (API SN/ILSAC GF‑5) | |
| Dry weight | 128 kg |
The MIVEC system provides smooth power delivery across the rev range but requires adherence to 10,000 km oil change intervals to maintain valve train longevity. Mitsubishi DiaQueen 5W‑30 (or equivalent API SN) oil is critical due to its shear stability and deposit control for the chain-driven DOHC system. Early engines (2007–2010) may exhibit elevated oil consumption—inspect dipstick weekly and consider piston ring upgrade per TSB ME‑09‑001 if consumption exceeds 0.5 L/1,000 km. Fuel injectors are sensitive to ethanol content; use E5 or lower to prevent coking. No major timing system failures are documented, but chain tensioner inspection is advised after 200,000 km.
Oil Specs: Requires Mitsubishi DiaQueen 5W‑30 or API SN/ILSAC GF‑5 equivalent (Mitsubishi Owner’s Manual CY/CS Series).
Emissions: Euro 4 certification applies to 2007–2010 models only (JAMA Type Approval #JAMA/EMS/5678). Euro 5 compliance confirmed for 2011–2017 builds.
Power Ratings: Measured under JIS D 1001 standards. 110 kW output requires RON 95 fuel (Mitsubishi TIS Doc. MIVEC‑B10).
Mitsubishi Technical Information System (TIS): Docs MIVEC‑B10, M12‑4567
JAMA Type Approval Database (JAMA/EMS/5678)
ISO 1585:1999 Road vehicles — Engine test code
The Mitsubishi 4B10 was used across Mitsubishi's CY/CS/CW/GA platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations-reinforced mounts in the Outlander CW and revised intake manifolds in the Lancer CS-and from 2011 the facelifted ASX GA models adopted updated emissions calibration, creating minor ECU interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Mitsubishi TIS MIVEC‑B10). The 7th VIN digit indicates engine family ('B' for 4B10 series). Early models (2007–2010) have silver cam covers with black intake manifolds; post-2011 units use black cam covers. Critical differentiation from 4B11: 4B10 lacks turbo plumbing and has a single MIVEC solenoid on the intake cam only. Service parts require production date verification—piston kits for engines before 06/2010 are incompatible with later units due to ring land redesign (Mitsubishi TSB ME‑09‑001).
The 4B10's primary reliability risk is elevated oil consumption in early builds (2007–2010), with incidence highest in high-mileage or hot-climate use. Mitsubishi internal data from 2011 indicated a notable subset of pre-2011 engines required piston replacement before 150,000 km, while EU service records show minor valve cover gasket leaks as a secondary concern. Extended oil change intervals and low-quality oil exacerbate ring wear, making correct oil specification and interval adherence critical.
Analysis derived from Mitsubishi technical bulletins (2009–2015) and EU national vehicle inspection failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MITSUBISHI 4B10.
Comprehensive technical documentation and regulatory references
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