I know M54s burn oil but very recently I am burning a lot.
I have had "minimal" oil consumption; probably a quart every 3500 miles but I topped off a month ago, and it has burned at least a quart and a half. I am unsure of the mileage, but I know it has been under 1k miles.
I have not changed my driving style. I did a 1,300-mile round trip in July. I believe I burned a little oil on that trip when I checked, but not enough to even need to top off.
The engine has 117k. I have not done the 02 pilot mod or any engine flushes yet.
Any idea why all of the sudden it starts burning a lot of oil?
I have been reading other threads about oil consumption and besides carbon build-up, I am not sure why it would start burning excessive amounts of oil. And no, I don't baby the car, it sees high RPMs often enough to "hopefully" not get carbon build-up.