🟡 Subaru WRX STI EJ207 engine spun bearing — high mileage

Catastrophic engine failure with a deep knock followed by complete engine seizure. The EJ207 engine in the Subaru WRX STI is a high-performance unit that requires meticulous maintenance. Spun bearings are caused by oil starvation from oil pump cavitation under sustained high-G cornering, degraded oil, or oil that is too thin for the bearing clearances. Using 10W-50 fully synthetic racing oil, frequent oil changes (every 5,000 km), and a dry sump conversion for track use are the preventive measures.