id="black"> Chad: This is a very difficult question, I used to be a mecahnic years past and used to teach auto mechanics and, also owned an auto supply. You will find this one of the most difficult questions; and I have never found a mechanic that could answer this. I found this out in about 1956 +/- from the Perfect Circle Piston ring manufactures engineer. In order #1. Seal #2. Cool #3. Lubricate #4. Clean Sorry to bore everyone. Rolland Pruner