A customer brought in his 2008 BMW M3 after an oil sample test came back showing excess amounts of lead in the oil. The vehicle had relatively low mileage so we determined that the lead was most likely coming from the rod bearing material. After removing the bearings, see above, it’s pretty clear that this engine does indeed suffer with excessive rod bearing wear. Luckily, the rod bearing wear did not cause damage to the crankshaft.
From previous experience, our technicians knew that this was a recurring problem with the BMW S65 V8 model. While the cause is still unknown and subject to speculation, we installed a new rod bearing kit from VAC Motorsports to correct the problem. The coated bearings from VAC Motorsports are friction resistant and are proven to reduce thermal breakdowns that can occur due to lack of lubrication.
You should be worried about rod bearing wear affecting your BMW M3. We recommend that the bearings are replaced as a precaution against engine failure. As a minimum you should give us a call and arrange an appointment to bring your car in for an oil sample test. More information on our M3 Rod bearing Replacement Package is available on request.