What could be the symptoms of a stuck (closed) crankcase breather valve (PCV Valve)? My 97 M900 has started to use oil and I've had the valve stem seals replaced, but it's still using. I'm trying to tic off the possible problems one by one before I get into the motor. When I had the oil filler cap off one time and started the motor, it seemed like there was a lot of pressure in the crankcase (oil flying all over the place out of the filler hole). If that valve get stuck closed, could that cause oil burning? HELP!