Pull the dipstick while it's running and then put it back in. If the engine pitch doesn't change there's a leak somewhere/bad CCV. Also works with the oil fill cap. If there's a leak the car's already idling poorly and you'll hear no dipstick. Removing the dipstick just creates a leak so you can test if the system is tight.
2000 528i Sport Premium 5speed
Last edited by DPP528; 12-04-2012 at 02:36 PM.