This page will document the installation of an Oilguard Oil
Bypass Filtration System on a 2002 Ford F250 Powerstroke. Thanks to Dan
Clifford and Gene McMillan for their help with the installation. This
system was purchased directly from Oilguard along with 3 additional filter
elements and 3 pre-paid oil analysis kits. The bypass system cost $180
with the optional drain plug installed, the filter elements were $13 each and
the oil analysis kits were $10 each. The kit includes almost everything
needed to perform the installation. A few items you will need that are not
The kit included the filter assembly, hoses, fittings and a good set of instructions with photos. It should take between 1 and 2 hours to install.
The first step is to take a look under your truck and decide where you want to mount the unit. You will want to put it in a protected place within reach of the hoses. I chose under the drivers seat on the outside of the frame rail. The fuel filter is located close by on the other side of the frame rail. Check to make sure that the filer assembly will fit where you want it and that there will be room to change the filter element. Remove the mounting bracket from the filter assembly, hold it in place against the frame rail and mark the holes with a pencil for drilling. The location I chose already had 1 hole in the frame rail that I could use so I temporarily bolted the bracket in place.
Remove the mounting bracket and drill the 3/8" holes in the frame. Make sure you don't drill into anything on the other side of the frame rail. Then install the mounting bracket. I used a flat washer between the bolt head and mounting bracket and a flat washer, lock washer and nut on the back.
Now remove the 2 plugs for the hose fittings. The first plug is located on the unit that your regular oil filter spins onto. It is just above and forward of the oil filter and is shown in the first photo below. It requires an 11mm wrench or socket. The second plug is located on the engine block just to the rear of the top of the oil filter and is shown in the second photo. This plug requires a 5/16" square socket to remove. Put Teflon tape on the fittings and screw them into the holes. Don't over tighten them. One fitting requires a 1/2" wrench & the other takes a 3/4" wrench.
Now install the two 90 degree elbow fittings in the Oilguard filter head. Use Teflon tape on the threads and don't over tighten the fittings.
The unit comes with one 8' hose. The position I chose to mount the unit allowed me to cut the hose in half and trim a little off each end. Make sure you check how you will route the hoses before you cut the hose into 2 pieces. Install the Push-Loc hose end swivels (the 2 little fittings with a hose barb on one end) in both ends of each hose. Lightly coating the fittings with oil greatly aids in sliding the hoses on.
Now mount a hose to each of the two 90 degree fittings on the filter head.
Install the Oilguard filter assembly in the mounting bracket that you bolted to the frame rail. You may have to adjust the 90 degree fittings a little bit to clear the mounting bracket. Run the hoses in a way that they won't chafe on anything and won't get caught on the drive line. Zip tie them in place at several locations. Screw the remaining Push-Loc hose end swivels onto the fittings near the stock oil filter. Don't over tighten them.
You're finished with the installation. Start the truck and check for leaks. Allow a few minutes for the Oilguard filter to saturate with oil, shut the truck off and top off the oil. Mine required an additional 2 quarts. If you can think of any way that I can improve this page, please contact me at mailto:firstname.lastname@example.org
I have posted additional photos below. I hope this information was helpful.