looking for some advice on the girlfriends BMW, it has 120+K on it and she has always been a regular Mobil one user. She was adding oil every so often between oil changes, so i found and repaired some oil leaks (no more spots in the garage) then the car developed a misfire so I replace the spark plugs because she could not remember the last time they were changed they seemed to have what appeared to me to be oil burning on them. She still has to add oil but not as frequently, so my question is what would be considered "normal" consumption on this vehicle before I do a consumption test and would going to a conventional oil help or possibly a different weight??? I also replaced the PCV system completely as I found it to be a common problem. Thanks

Jeff Roncace
Consultant
Jeff Roncace
Pennsville, New Jersey, USA