Me and my Son's have used Lucas Heavy Duty Oil Stabilizer for years in everything from our Street Cars to Lawn Mowers. I have ran the Synthetic Oil Stabilizer in my Harley Davidson's (oil temp dropped 10 degrees), our Jeeps differntals, transfer cases, power steering pumps, transmissions, etc. I have never had an oil related falure and I lean on my vehicles pretty hard! Thank you for a superior product line Lucas!