Well I noticed a puddle of oil on my driveway after leaving for work the other morning. The oil level is still spot on, but I think the thermostat gasket spewed some oil. The leak seems intermittent (probably leaks out when the oil is thick and oil pressure is high).

Parts are en route. I don't know why I put up with the third-world build quality of BMW's engines. The engine will be nearly brand new via repairs by the time it hits 100k.

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2007 E70 4.8i