FYI- Grease monkey for many years used a filter manufactured with their name on it. It was very recently discontinued, so I imagine they went with a cheaper supplier that would not rebrand the filters just them. The oil type probably varies between location as I do not believe Grease Monkey has an oil supplier contract they are forced to use but I could be wrong. I am pretty sure most of the techs will have no idea who the actual manufacturer of their filters is. It is probably a rebrand or clone. Be careful, the abscence of any real minimum oil filter standards has put some real crap out there aimed at the installer market. Fram is a big player in this market with about 50 different names, as well as some other oddballs like TVI, Filter Max, AFC, Filter King and others you have never heard of.