Quote:
Originally Posted by TinCanSailor
My car had the bearings replaced by bmw as a preventative measure and the engine still ate itself. The rod bearings have proven themselves to be a bit of an issue but knowing the warranty company didn't push back on the replacement then I'd prolly let it ride as well. Who knows what the prev owner did or if it was the mods maybe if you stick to a very short oil change interval and have the DP's coated you may be able to avoid a repeat. Just know that a new factory engine isn't an assured path to never seeing the issue arise again.
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It's not the bearing, it's the crank.... Telling you, if BMW would actually allow access to the data this is a bad batch of machining on the cranks. Rod journals were not concentric or off spec for whatever reason.
For the OP, I wouldn't be worried about a new factory motor. Break in is critical for these things and seems to be critical for oil ring seating and how much oil it burns (they all burn it, proper break in seems to keep it minimal).
Regarding coating the DPs, I've just sent a set off to Swain for whitelighting.
