← Subaru WRX (GD/GG, 2002-2007) problems
Valve cover gasket oil leaks on the 2.5L EJ255
Q: What causes "Valve cover gasket oil leaks on the 2.5L EJ255" on the Subaru WRX (GD/GG, 2002-2007), and how is it fixed?
A: An enthusiast blog lists valve cover gaskets among common EJ255 problems and calls it normal age and mileage wear (typically past about 100k miles or 10 years), not a design flaw. Fix: Replace both valve cover gaskets; the blog calls it a moderate DIY job (coil packs and breather hoses come off).
Symptoms
Oil seepage at the valve covers, burning-oil smell or smoke from the engine bay.
Cause
An enthusiast blog lists valve cover gaskets among common EJ255 problems and calls it normal age and mileage wear (typically past about 100k miles or 10 years), not a design flaw.
Fix (summary)
Replace both valve cover gaskets; the blog calls it a moderate DIY job (coil packs and breather hoses come off). Rule this out before assuming a head gasket leak.
Other GD problems
- Cracked piston ring lands from detonation
- Rod-bearing wear on the 2.0L EJ205
- Clogged oil-feed screens starving the turbo (P0011)
- Timing belt is an interference-engine risk; 105k mi / 105 months
- Stock transmission/clutch is the fuse under extra power
- Worn synchros (3rd gear) and cold-shift shudder
Sources
- 4 Most Common Subaru EJ255 Engine Problems — 8020 Automotive (enthusiast blog) (vendor article; read 2026-10-20; search excerpt only)
Summaries are in our own words. Not repair instructions; consult the factory service manual.
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