These completely replace the failure-prone stock oil cooler lines and quick-connect fittings. If you see any signs of leaks or don't know how old your lines are, they should be replaced immediately to prevent possible engine damage. Issues often become evident during winter months where the rubber lines are less flexible and blow due to higher pressures with thick oil trying to circulate.

This kit comes with custom machined fittings for your oil cooler that allow it to be a complete bolt-in kit for trouble free operation and engine protection.

97+ style 6.5L engines have 1/2" oil cooler line ports.

The black hex lower portion of your oil cooler should measure 1 1/4" or 32mm if you have 1/2" style oil lines.

92-96 6.2L and 6.5L engines have 3/8" oil cooler line ports.

The black hex lower portion of your oil cooler should measure 1" or 26mm if you have 3/8" style oil lines.

During installation, screw all lines onto the fittings until they seat, by hand, then turn an additional 1/4 turn with a wrench to tighten. All pipe thread connections require sealant while the flare fittings for the hoses require no sealant. It also helps to attache the hoses to the engine side first, then the oil cooler last. Please seek installation help via a professional mechanic if you are not comfortable with this job.

Please double-check and ask questions before ordering since many engines have been replaced over the years and don't match the model year of the truck. Replacement oil coolers are also available to complete the job where necessary.