Some guy I work with said he herd it on 770 am talk radio out of cincy,Ohio. The company, MOTORKOTE is in Gahanna, Ohio, they sell it online or in truckstops, like TA, Roadranger PILOTs, Flying J's too I think. It's somewhat pricy, but 1- 32oz. bottle I read on, for heavy duty diesels you put in 2 or 3oz's per each quart of oil the engine holds . It treats the metal not the oil !! It's used at every 4th oil change, they say? The guy I work with said a team in nascar or some racing team, got caught using MOTORKOTE oil to soak the motor parts when they built the race motors, BUT DID NOT ADD IT TO THE OIL !!! He said they found it after they won alot of races in a row, by testing inside engine metal parts!! they sale gas / diesel treatment too, 1- 16 oz bottle treat 160 gallons. MK Oil can be put in auto, manual trannys, differentials, transfer cases, and power steering boxes too, It's the same oil used in the engine oil tooo!!