AMSOIL Cummins Single-Remote Bypass System (BMK34)
A vehicle-specific bypass filtration system for supported Cummins applications. Check AMSOIL's current fitment information before ordering.
View BMK34 at AMSOILBypass Filtration
AMSOIL Bypass Oil Filter for 6.7L Cummins
See how bypass filtration fits into a Cummins diesel maintenance plan and watch our real-world installation.
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What bypass filtration adds
A full-flow oil filter must pass the engine’s required oil volume. A bypass system supplements it by slowly filtering a smaller stream of oil through finer media. For diesel owners who accumulate many miles or operate under heavy towing service, that can make bypass filtration worth researching.
6.7L Cummins Oil Bypass Filter Installation
This installation video shows the layout and practical considerations of adding an AMSOIL bypass filter to a Cummins tow vehicle.
Installation and maintenance considerations
Mounting location, hose routing, fittings and access for future filter changes matter. Follow the current AMSOIL instructions for the exact kit and application. After installation, inspect all connections for leaks and recheck them after the engine has reached operating temperature.
Related AMSOIL guides
Frequently asked questions
What does a bypass oil filter do?
A bypass filtration system routes a small portion of engine oil through a very fine filter and returns it to the engine, supplementing the full-flow filter rather than replacing it.
Does a bypass filter replace the full-flow oil filter?
No. A bypass filter is designed to work alongside the engine’s full-flow filtration system.
Should I extend oil-change intervals because I installed a bypass filter?
Do not assume an extended interval automatically applies. Follow AMSOIL product guidance, oil-analysis recommendations where applicable, and the engine manufacturer’s requirements.