While we are on the subject, I was after some info. My uncle owns light plane and CASA has informed me that I can't add this to the engine due to a couple of things, 1. It's not an approved addative nor a patented product and the chemical composition is not up to aeronautical standards yada yada yada?!?!? and 2. It reduces metal integrity by imbedding it’s self into the metal which on constant revving engines can cause a decrease in thermal efficiency. Sounds a bit ‘how ya going’ to me, didn't really get a straight answer from them, but do you know if any of this is correct? Thanks