Subaru WRX
Turbo boxer with 2.5L — the WRX engine of the GR/GV era. Same ringland vulnerability as the EJ257 (cast iron pistons with thin ringlands), but slightly less boost from the factory. Oil pickup tube crack, rod bearing failure, and timing belt are the three big concerns. Class action for 2012-2017 models extended warranty to 8 years/100k miles.
265 hp turbo boxer — same weaknesses, more power
More displacement than the EJ205, but also more ringland risk. The GR/GV WRX is the workhorse of the scene. Hatchback version cult-worshipped, sedan more common. From Stage 1 it gets properly fun — stock is competent but not exciting.
Engine Weaknesses 5
Cast iron pistons with thin ringlands crack under detonation (knock). Causes: poor fuel quality, bad tuning, high exhaust gas temperatures. The EJ cliché alongside the head gasket.
Symptoms: Misfires at idle after high-load driving, increasing oil consumption, blue smoke
Class action for 2012-2017 WRX/STI: extended warranty to 8 years/100k miles. Oil starvation from boxer sloshing or neglected oil level as primary cause.
Symptoms: Knocking noise, oil pressure warning, metal particles in oil
Identical problem to EJ205: brazed joint cracks from vibration. No recall despite known issue since 1996.
Symptoms: Sudden oil pressure drop, engine noise, oil pressure warning light
Timing belt replacement every 105k miles mandatory. Same interference risk as all EJ engines.
Despite MLS gasket from the factory, the head gasket can fail under overheating or neglected maintenance. Less systematic than the EJ253 NA, but not immune.
Symptoms: Overheating under load, coolant loss, white smoke
Vehicle Weaknesses 4
Recall (2002–2007): Front lower control arms corrode at the hanger bracket from road salt and can break. Affects 21 US salt-belt states. Free replacement at dealer.
Recall WQK-47: splash water through gap in fuel tank guard corrodes steel brake lines. Brake fluid loss possible — safety critical in salt-belt regions.
Typical Subaru wear item: wheel bearings fail early, especially in salt regions. Rear wheels more frequently affected than front.
Windshield rubber seal becomes brittle with age — water enters the cabin during rain, especially at the lower corners.