You know the ones, they insist on using motorcycle brand motor oils (HD, Honda, Yamaha, etc.) in their bikes because they're mentioned by name in the owner's manual. I tell them as long as the weight and spec are correct, brand doesn't matter. I've even had guys argue with me saying that if the manual calls for a brand, that oil must be used. I don't get it. Why pay double the price when it isn't necessary?