Here's the deal we run two 1441cc Kawasaki zx14r drag bikes. Currently we run Amsoil 20w 50 with great success. However our dilemma is cost. Each bike takes almost 5 quarts and we change out the oil after about 8-track passes and it gets expensive. Reason the oil is changed out so often because in drag racing you hammer the clutch off the starting line and you end up getting a lot of clutch debris in the oil which can clog up the oil pick up tube. So my question is what oils out there do you feel can handle being shared as an engine and gearbox lubricant not break down but not break the bank either. If I have to spend the money then that's what I have to do to protect the life of the engine but I just wanted to know what other reliable options are out there with better pricing.