Impreza / Forester
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Which Subaru Impreza / Forester engine is the most reliable? See common problems, reviews and reliability verdicts across generations and engines.
Frequently asked questions
Which Subaru Impreza / Forester engine is the most reliable?
2.0 Boxer petrol (EJ20 / FB20) — Maint. Sensitive verdict. The FB20 boxer is the newer-generation 2.0 petrol — chain-driven and a clear step up from the old EJ on head-gasket reliability. It's adequate rather than quick in a heavy AWD car, and the FB family's known trait is oil consumption from low-tension piston rings on some examples (usually after higher mileage). With standard AWD/CVT servicing it's a dependable, low-drama engine; check oil level and consumption history.
Which Subaru Impreza / Forester engines should you avoid?
Engines with the weakest reliability verdicts: 2.0D Boxer diesel (EE20).
What are the most common Subaru Impreza / Forester problems?
The most commonly reported problems across all Subaru Impreza / Forester generations and engines: Head gasket failure, Crankshaft failure (early 2008–2011), Crankshaft / block cracking, Coolant maintenance dependency, Timing belt/chain + oil discipline.