Cummins diesel engines power trucks, buses, generator sets, construction machinery, agricultural equipment and marine units around the world, so Cummins-engine filters are among the most requested heavy-duty replacement parts. This page groups oil, fuel, air and related filters for popular Cummins engine families, including the X15/ISX15, L9/QSL9, 6BT/6CT and KTA series. Common references include Cummins 3401544 (Fleetguard LF9009) for L9, ISL9 and other engines, 3932217 (LF3349) for the 6BTA5.9, and 4367100 (LF14000NN) for the X15 and ISX15. Filter numbers vary by engine serial number and build, so please send the engine model or the old filter number and we will confirm the match. OEM/ODM service is available. ADAOER Filter.