Quote:
Originally Posted by pbonsalb
I don’t think BMW had much S85 rod bearing failure data in 2007 when the S65 came out. The S85 had been around for 3 years at that point.
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They will have had the numerous engines that they themselves ran to destruction on test beds. All the cars from the test fleet, the ones run for NVH testing, the ones run for cold and hot environment testing, etc etc.
And if the S85 followed the pattern seen in S65 engines (but slightly more pronounced) then they will have had quite a few low mileage warranty returned engine failures to pull apart.
But yes they won't have been swamped with failed engines...but they will surely have known exactly what the weak points of the engine were.