985840 ''Big Oil'' service kit. Mineral SAE50. Chrome filter

This MCS Big Oil kit is tailored for the Ironhead Sportster, specifically fitting 1980 to early 1984 XL models. It features three liters of Vspec SAE 50 mineral monograde engine oil, which is the traditional choice for these classic air-cooled engines. The kit also includes one liter of dedicated primary and transmission oil to keep your drivetrain shifting smoothly. For filtration and sealing, you get a chrome spin-on oil filter, equivalent to OEM 63782-80, and an 11139 O-ring for the primary filler cap. This kit is a convenient way to perform a full oil service, ensuring your vintage Sportster has the high-quality mineral lubrication it needs to handle mechanical and thermal stresses. This set is sold as a kit.