S54 connecting-rod bearing wear (2001–2003 service action) (2001–2006 (service action covered early 2001–2003 cars))
Major repair- Chassis:
- E46 M3
- Years:
- 2001–2006 (service action covered early 2001–2003 cars)
- Engine:
- S54 3.2L inline-6
Early E46 M3 engines were built with connecting-rod bearings that wore faster than intended, and a worn bearing can lead to sudden engine failure. BMW ran a non-compulsory service action (SIB 11 04 04) on 2001–2003 cars; a car that had the work done is generally regarded as being on par with later builds. Owners and specialists still treat rod bearings as a wear item on the S54 and commonly replace them as preventive maintenance at high mileage. Using the correct high-viscosity oil and sensible warm-up habits matter on this engine.
Symptoms
- Often none before failure
- Knocking from the bottom of the engine
- Low oil pressure warning
- Bearing material in used oil
Check before buying
- Ask for proof of the service action or a later preventive rod-bearing replacement
- Have used oil analyzed for bearing metals
- Check the build date and service history for the correct oil