For the money you spend on the Harley stuff, which is a synthetic blend by the way, you can buy Mobil 1 full synthetic which in my opinion is a superior product. It is also available at most any auto parts store and some Wal-Marts. You can use the automotive stuff in the engine. I prefer the gear lube, 75-90 in the tranny. Don't use auto stuff in the primary because of the clutch. You can pick up a quart of Shell Rotella T in 15-40 for that.