I know in years past the old m1 red top 15w50 was a commonly used mc oil but I havent seen anything on it in a while. Are people still using it since it changed? I saw it in walmart the other day for a little over $6 per quart so its a little cheaper alternative to there bike oil at $9.50. I am fixing to change the oil for a 4 day trip to the north ga mountains and m running castrol dino mc oil that the dealer put in but am looking for an alternative. I have been using rotella in all my other bikes but just got the fz1.