4 speed Big Twins from 1982 on were equipped with oil filter cartridges that were screwed to a base plate behind the transmission. Sportsters 1980-early 1984 used the same filter, but the base plate sat over the transmission or on the front motor mount. Sportsters with alternator had the oil filter mounted in front of the front cylinders, just like the later models. The pore size of these filters suit the gear oil pump of the Big Twins and the gerotor pumps of the Sportsters.

All 5 and 6 speed Big Twins have these cartridges, as well as all Evolution Sportster models late 1984→ and Buells →2002. These filters have 6 or 10 µm pores. Dyna models with Evolution engine use 5.5” long cartridges as a standard. This provides some extra ounces of oil to these sporty bikes.

Oil filter cartridges which suit the Eaton type pump of all V-Rod models.

Oil filter cartridges which S&S Cycle recommends for their SH-Series (Shovelhead type) and V-Series (Evolution type) engines.