Originally Posted by tommyd73069

If this were a gas engine, I'd say the Oil Water Separator is prbably full of oil/water slushy. This will cause crankcase pressures to blow the dipstick out, seals to leak and oil to be pumped into the combustion chamber. The Positive Crankcase Ventilation (PCV) system prevents pressures from building in the motor. The system should run at a slight vacuum, so there's no room for pressure. If this is the same system on the diesel engine, you'll have run-on after shutting off the ignition once this becomes severe. Search the threads that deal with Oil Separator PCV issues. It's a winter curse of BMW owners. You'll find 100s of forum threads on this topic. It is a normal part of owning the Ultimate Driving Machine :-)