Quote:
Originally Posted by Dumaurier7
If you want a piece of mind then upgrade to the S55 oil pumps and sump.
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^ S55 oil component upgrades would be the best. Keep your maintenance schedule on top and I'd start doing your changes every 2-3k miles considering your modifications.
Other than that the N55 is still one of the most reliable bmw engines, they've been out for about a decade but have proven themselves, of course they still have their weak spots.