I have a 96 850 that recently broke 100k miles and have noticed it is burning a quart of oil every two weeks and only a few hundred miles. a friend who works on cars and also owns an 850 looked at it and said he doesn't see it blowing blue or oil smelling exhaust nor is it leaking anywhere. We did just change to synthetics but he says that's not it. says maybe something with valves or rings causing this. he says a ring job or rebuilt engine can be pricey but that there is some oil additive called miracle oil or something that can be added to loosen the rings. he says this can either fix the problem or make it worse. Anyone have an idea about this? any suggestions on what to do? the car is in great shape but i can't see spending a few thousand on it at this stage in the game. Thanks for listening.