The #6 cylinder was very slowly leaking coolant through a worn head gasket. So, the top end of the engine is being rebuilt, along with new timing chains and guides.

Two of the spark plugs were contaminated with oil and the valves were leaking, so that is likely a significant component of the oil consumption (1 qt per 1,000 miles).

The piston rings are not going to be replaced. Not cost-effective. It will be interesting to see what the new oil consumption rate will be after the work is done because theoretically it will all be coming from worn rings.

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Mark
2001 3.0 Original Owner, still going
2012 E70 xDrive 35i Pre-Owned -- sold because no one could figure out the transmission problem