Quote:
Originally Posted by JimD
I hope 1 extra quart doesn't result in the crank finding the sump oil. I guess you've done it and not seen signs. I also guess you think your engine may starve for oil if you don't add the additional quart. I doubt that on a BMW.
The crank hitting the oil is one possible effect but even without that it can raise the pressure inside the crankcase resulting in oil getting past seals. That would be especially true at higher rpm when the pressure inside the crankcase is elevated anyway.
I think 6 quarts in a 180 cubic inch engine is quite a bit of oil. With a properly designed sump, which I assume I have, I think the engine should never run out. I've owned several cars with bigger displacement engines and less oil in them and they were fine.
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The large(r) oil sump of the N52 I'm sure also has to do with oil life, rather than lubrication needs of the engine. The added volume should help with additive depletion and allow longer miles for your OCI.