To make this short: GTO is not petroleum. It is not ZDDP. It is not toxic. The regular GTO treatment process is done specially with mixed petroleum oil because degradation in petroleum oil do happen. For those using GTO as the only engine oil in their engine, meaning not mixed with petroleum oil, it remains clean everyday like you just changed your oil yesterday even using it for four straight long years and counting. These are facts that will not happen in your petroleum world. These are facts you cannot accept because it is not in your vocabulary and list of experiences. The more you cannot accept these things simply because you haven't tried it yourself. We may not agree on every thing simply because we do not take exactly the same road everyday. However, the door is not close for you to try new things on another road you've never heard before.