I know some say don't add any oil additives, just figured i would see what the opiniont was. My Grandfather recnetly brought me a little info on this Polydyne Tx7 stuff. Any experiences or heard any info about it. One fella was telling me his brother used it in a duramax with every 2 oil changes and it gave hime at least a 1mpg difference. I am real leary of such things as this and just wanted any input.

 

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I wouldn't add anything to the oil especially with the HEUI injection system that uses oil to drive the injectors...

 

Thanks guys, gonna stick to my regular oil, will swithing over to ams oil 15-40 on next change though.