Quote:
Originally Posted by Sophisticated Redneck
I remember hearing rumors of S63's with defective oil pumps in the F10 M5, the oil pump is chain driven and the shaft was not welded correctly to the hub and after 60-80k miles it would start slipping and eventually become loose enough to loose oil pressure...
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I believe the S63 engine was unique to the 2010-2013 X5M/X6M. The F10 M5 actually has the S63TU engine. Regardless though, its possible the same problem on the F10 M5 exists on the X5M. I do not know if the oil pump design is different between the S63/TU
Though has anyone actually noticed a bad oil pump on an S63? I can't recall if folks have seen the idiot light come on for oil pressure, or if they noted it before the engine went.
This is probably the 3rd or 4th tuned X5M I've read that has potentially trashed its rod bearings.
Another theory... I wonder how many of those with trashed rod bearings had owners who used too thick of an oil weight like 10W-50 or 10W-60. It's known to cause problems with oil starvation on tight tolerance bearings and can cause them to wear early. This also seems to be a "popular" on the forums anyway modification on S63s with no supporting evidence this is a good idea, especially on sick engines that are burning a lot of oil anyway.