Big Bike Lube was specially formulated for 2000 and newer Harley-Davidson® motorcycles with the updated Twin Cam and Evolution engines. Big Bike Lube is a 20W-50 fully synthetic motor oil that will also carry the load of a 90W gear oil (without the sulfur or smell.) Big Bike Lube can be used in primary, transmission & crankcase on your newer Harley-Davidson®.