Quote:
Originally Posted by mxa121
It is safe to say:
All S65 engines experience rod bearing wear.
Not all S65 engines fail due to rod bearing wear.
If the M3 is a car you want to buy, drive hard, and keep, it would be a wise investment to have them swapped at some interval. The interval depends on the car's prior use, modifications, and proposed use.
(i.e. track rat supercharged, do it now and every 40k. or daily cruiser, maybe every 80k)
On a 2008-2010 M3, you can track bearing wear by getting oil analysis done at each change. You can see the lead content (bearing material). Excessively high lead content would mean pull the bearings. Low content, probably OK. That's what I did.
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Claiming that ALL S65 engines wear their bearings is clearly not true, we have seen high mileage bearings come out fine. What is a fact however is that the absolute majority of the 65.000 produced S65' continue to run strong as we speak.
Also fact is that some engines certainly experience bearing wear, reasons for this being debated, such as lack of maintenance, poor warm up, tolerance stack up, tight bearing clearance, maybe in combination.
So yes some experience issues but FAR from all.