Abstract: An oil filter/cooler includes a finned metal canister attached to an oil return pipe by a port nut, and houses a replaceable filter cartridge. Oil transport conduits are located on the outside of the fins, transporting oil from the exit port on the motor to the distal end of the oil filter/cooler. The oil is then channeled back toward the oil return pipe, moving radially outward through the replaceable filter cartridge, before traveling again to the center line of the oil filter/cooler and through the port nut and oil return pipe.

Abstract: A modular oil filter is used in an engine with a spin-on type oil inlet port. An adapter is screwed onto the inlet port, and secured thereon by a lock nut. A backflow valve may optionally be secured between the lock nut and the adapter to cover the oil entrance(s) in the adapter. A replaceable oil filter element is coaxially located against a seal shoulder of the lock nut. A housing or canister surrounds the filtration element and releasably secures to the adapter. The filter element may have outwardly extending tabs, an inner or outer diameter releasably connected to a spring coil, or other means to releasably secure the filter element within the canister prior to being placed on the adapter/lock nut.