[335dsleeper]

Op you need to ensure your engine is working as designed. The PCV/CCV system on the N52 can be problematic. Ensure yours is working correctly as you will have an increase in oil consumption if not.

The cyclone separator can clog or drain slower resulting in an increased oil consumption rate. Also, the slightest vacuum leak can reduce the cyclone separators effectiveness, meaning, any engine gasket, intake gasket, hose, oring that isn’t sealing 100% “can” reduce the cyclone separators effectiveness and again, can cause an increase in oil consumption.

2qts in 8k is a lot, 4qts in 12k is excessive and neither are normal.

For comparison, my e70 X5 at 199k miles used 1.5qts in 13,692 miles on the oil. In fact, not one of my bmw’s have ever consumed more than 1qt in 5-6k miles, even when tracked, supercharged or turbocharged. I’ve owned 9 BMW’s over the last decade and not one, including 2 x M cars and 3 x M engines consumed more than 1qt ever 5-6k miles.

If your CCV system, engine sealing and proper weight oil is used, you shouldn’t be consuming more than 1qt every 5-6k.