What I was getting at with the RX7 thing was if the car was indeed running rich, it would have a black smoke mixed with the blue of the burning oil in the combustion chamber. That would be a very dark blue smoke. But hey I guess every car manual and internet site I've ever read on the subject is wrong, and you are right. I'm not going to pursue this converstation any longer as you obviously have your mind made up. I do, however, suggest you read up on the subject some and IF you find any evidence that states a car running rich will have a blue smoke then you post it here. That is all.