It's made by a company purchased by Quaker State, but it's not Quaker State. I think we determined that it's identical to SuperTech. It's also, if my store is any indication, being phased out. However, all things being said, any SL oil is worth 50 cents. Since I use SuperTech and one of my cars burns oil I'd buy some extra quarts of Motorvator and throw them in when the oil level was low without a thought. However, I can't find any for that price.