1995 525it, M50: excessive engine oil consumption

[werminghausen]

Compressions tell you if your engine is worn and thus burning oil. The idea of the drop of oil is to form a temporary seal on top of the piston to see if the compressions improve. You can remove the pump fuse and run it until it dies. But there may still be some pressure in the system even after that.

Thanks, this makes sense. I'll run then 2 compression tests: 1 without oil and another with oil and see what the difference is. I'll report back. I guess the engine should be warm for the compression test.

[whiskychaser]

Thought I just replied to this but my answer isnt there :-( Just a brief word of caution. When I did my compressions I removed the plugs when cold, cleaned plug and head threads, refitted and warmed up the engine. Then removed them again and did the tests. There is a small risk you could strip a thread on an ali head if you install/remove plugs when its warm. Hence my rather roundabout method