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Red Line's 20W-60 synthetic oil is blended specifically for air-cooled V-twin engines with traditionally wide clearances, such as Knucklehead, Shovelhead, and Panhead motors, as well as Evo and Twin Cam engines running big-bore or stroker kits. The ester base stock provides strong film strength for ring seal and protection, which matters most in hot climates or under sustained load.
Packaged in a 1-quart bottle, it's a convenient oil to keep in the rig for topping off or servicing a motorcycle brought along for the trip.