Ok i have a 2002 chevy cavalier that smokes black if i get on it a little I'm replacing the o2 sensor on it to stop making it run rich. now i figured that the plugs were getting fouled out and so i pulled them 2 . so i took a look at them but the look like my car is also burning oil cause of the white clump spots on it. my question is if the car is running rich could it try to correct itself by also throwing oil into the equation and cause the build up on my plugs cause i hope its not from the rings or any thing else.