i had a bad motor in my car went i bought it and the 2 spark plugs used to get covered in oil. So out of bordom i bought a can of seafom and ran it through the vacc line. i did about half a can and pulled the plugs that are normally soaked in oil. Guess what...the plugs looked brandnew. the car ran a little bit better but i was down 1 cylinder it had a hole in it and the other was covered in oil because the one valve seal was toasted lol