How To Change Differential Oil in Subaru

How To Change Differential OilIt’s time for a How-To Article! This time I put an article for a gear oil change tutorial. Gear oil can be used for four-wheel differentials of many kinds of cars. So, if you were looking for an article or tutorial on How To Change Differential Oil in Subaru or 2003 Subaru Forester to be more exact, then you came to the right place. Since I didn’t have the pump, I used a funnel with a hose (or tube) to fill the gear oil back into the differential. Of course there is not enough space in the back and under the car to be able to properly fit the funnel. So I had to compromise ;) I drilled a hole under the spare tire which made everything work out like a piece of cake. Make sure to read the whole tutorial before jumping into it, so you know for sure that you have everything that is needed for your differential’s gear oil change. So, let’s begin with the tutorial…

1. – Prepare the right Gear Oil and Locate the Plugs on the differential. Make sure that you get the proper gear oil for the specific make and model of your car. Then locate both of the plugs, one should be a little higher than the other. The differential is usually located on the very back and between of the rear wheels. The plugs (or nuts, or bolts) are usually pointing backwards also.

Prepare Gear Oil and Locate Plugs

2. – First, Unscrew Fill/Level Plug. Find and unscrew the higher plug (which is the Filler and/or Leveler Plug) for the air to come in while you’ll be draining the old dirty oil. Your plug might give you some hard time, I had to use a jack to push my big ratchet up in order to unscrew the Fill/Level plug.

First, Unscrew Fill/Level Plug

3. – Second, Unscrew Drain Plug. Now you are ready to unscrew the drain plug, but make sure you put some kind of a proper container under the drain plug to catch all of the dirty oil. After taking both of the plugs wipe them both very good, especially the bottom drain plug because it has a magnet on it to catch the metal shavings.

Second, Unscrew Drain Plug

4. – Drain the Dirty Oil. Be patient and let the old oil come out as much as possible before closing it back up. After the oil drained properly you can wipe the extra oil off and replace the drain plug back into its place.

Drain the Dirty Oil

5. – Drill a Hole Under the Spare Tire’s Location. If you don’t have anything to pump the new oil into the differential, then I’d recommend using my technique. Take out the spare tire from the trunk, locate the best and safe location to drill a hole through. Sand off all the sharp chips of metal before inserting the funnel with its hose.

Drill a Hole Under the Spare Tire's Location

6. – Insert the Funnel’s hose or tube through the Drilled Hole and into the Fill/Level Plug, and Fill the Differential until some Oil spills out into the Container. After the hose and the funnel are secured, go ahead and pour little by little the proper gear oil. Keep checking for the spills under the car and make sure to have the container under the differential to catch all of the extra oil that will spill out. When the oil begins to leak out of the Fill/Level plug, then stop pouring and let it level itself out before closing it back up.

Insert the Funnel's tube through the Drilled Hole and into the Fill/Level Plug

7. – Seal up the whole with a plug and some glue. While the oil is leveling itself out you can go ahead and seal up that new hole you drilled. I found an extra clip and I glued it in with some silicone. Make sure to seal it tightly so no moisture will come in. Also, remember to wipe off all of the extra glue, we don’t want the spare wheel to get glued ;)

Seal up the whole with a plug and some glue, like silicone

8. – Wait for the Oil to Level its self out. After the oil leveled, then you can put the plug back in and tighten it very good. Wipe everything clean, put away your tools, and recycle the old and dirty oil to a proper facility near you.

Wait for the Oil to Level its self out

Check out these helpful products for your Differential Oil Change…

Valvoline SAE 80W-90 Gear Oil, 1 quart individual bottle
Valvoline SAE 80W-90 Gear Oil, 1 quart individual bottle
Hopkins TF-1 Heavy Duty Transmission Funnel, 18 inch Hose, Red
Hopkins TF-1 Heavy Duty Transmission Funnel, 18 inch Hose, Red
FLUID TRANSFER PUMP-4CC
FLUID TRANSFER PUMP-4CC
75W90 SYNTHETIC GEAR OIL -- QUART
75W90 SYNTHETIC GEAR OIL — QUART

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