Well given your subject (air filter BEARING) I'm not sure if this is a joke or not. But if you are serious I would recommend sticking with the K&N oil as the others said (not sure about the AFE or AMSOIL filters - I'd assume they have their own oils). One thing I learned with my K&N's (in the past, I personally won't use an oiled filter on my CTD) is that you are far better off using their aerosol oil than the squeeze type, it's much easier to oil the element without over oiling it with the aerosol type spray.