- Engine / equipment
- S54 (M3 E46, Z4 M), S65 V8 (M3 E90/E92/E93) and S85 V10 (M5 E60, M6 E63)
- Period mentioned
- 2000–2013
- Symptoms
- Little prior warning; once wear is advanced, a metallic rod knock that rises with revs. On the S65 and S85, also jerking and limp mode from failing throttle actuators.
- Possible cause described
- Very tight rod bearing clearances and soft bearing material, made worse by cold oil, revving the engine before it is warm and poor maintenance. Catastrophic failure is rare, but premature wear is common.
- Check for the garage
- Oil analysis and bearing replacement history. Indicative preventive replacement: S54 around 130,000–160,000 km, S65 around 100,000–130,000 km and S85 around 80,000–110,000 km.
- Cost cited in the source
- Preventive replacement: approx. €2,800–5,500 (converted from dollars); a spun bearing costs far moreA rough figure from the original database, not an up-to-date quote.
Mileage cited in the database: 80,000–160,000 km. This is not a maintenance interval and does not predict a failure.