I was in Walmart yesterday and see that they have Mobil 1 15W50 oil for $22.00 for a 5 quart jug and was wondering if it would be a good oil for my 08 Hayabusa. Yes I know this is not a motorcycle specific oil. It's not a energy conserving oil so there should be no clutch problems it more than meets the API ratings SM/SL. I also like the fact that it is a 50 weight so it hold up better to the shearing effect of the tranmission And it is less than half price of the motorcycle specfic oils so I can change the oil twice as often for the same money. New fresh oil is a good thing. I know a quite a few people than use 15W40 Diesel oil in there bikes and swear by them. I was thinking this would be better yet. Just a thought. Thanks for your advice.