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Old 10-23-2012, 01:15 PM   #1 (permalink)
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Default differential Fluid

when to change them?
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Old 10-23-2012, 01:20 PM   #2 (permalink)
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15k if your driving is "severe." I think it's only "inspect" otherwise, so when it's needed. I just did it at my thirty month service, at about 19k miles.
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Old 10-23-2012, 01:48 PM   #3 (permalink)
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did you change them at the dealer? How long a job and how much it cost you?

thanks!
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Old 10-23-2012, 01:48 PM   #4 (permalink)
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I'd say a decent guide for normal folks would be 6 years or 60,000 miles. I think the schedule just says I for inspect. Really? how would you do that in the rear diff? just stick a finger in and see if oil is on it?

operation in the southwest, towing, racing, etc. would also be considered severe duty by many people - as would infrequent and short trips.

but really, a lot cars go to 150-200k and no one has changed that fluid. There's no combustion products in it, but, if you really use your soob on dirt, gravel roads and bad weather - where other cars would fear to venture out - then I think 30K or even 15 is not unreasonable. There is a vent and normal heating/cooling cycles will pull in a little dust and moisture over time. If you EVER ford deep water, you may need to swap the fluid asap as the cooling effect/pressure differential could pull water into the diff.
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Old 10-23-2012, 02:24 PM   #5 (permalink)
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how would you do that in the rear diff? just stick a finger in and see if oil is on it?
That's what the service manual says you do to inspect it.
Same with the front.
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Old 10-23-2012, 02:57 PM   #6 (permalink)
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That's what the service manual says you do to inspect it.
Same with the front.
what if there were a cup of water in the bottom or a chunk of metal on the magnet? Unlikely sure but, If I were gonna go the trouble to remove the top plug, may as well just pull and clean the bottom one and swap out the fluid.

but that's me.
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Old 10-23-2012, 02:58 PM   #7 (permalink)
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When the owner's manual says to.
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Old 10-23-2012, 03:09 PM   #8 (permalink)
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Quote:
Originally Posted by 1 Lucky Texan View Post
what if there were a cup of water in the bottom or a chunk of metal on the magnet? Unlikely sure but, If I were gonna go the trouble to remove the top plug, may as well just pull and clean the bottom one and swap out the fluid.

but that's me.
I don't disagree necessarily, but that is what the service manuals says you do to inspect and check the level.
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Old 10-23-2012, 03:56 PM   #9 (permalink)
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did you change them at the dealer? How long a job and how much it cost you?

thanks!
I did them myself. I did the front one evening, and the rear the next morning, about 2-3 hours total, including clean up. That time will be cut in half next time. For my 2010 I needed three washers, two for the rear drain and fill plugs, and one for the front drain plug. Front is filled through the dipstick. I bought Subaru Extra S from Fred Beans, which was pricey, 3 quarts for about $40 shipped. I barely dipped into the third quart. You need a drain pan, obviously, a long funnel to fill the front and some sort of pump to fill the rear. I used a suction gun to fill:
This one, to be exact This one, to be exact
. It worked great!

Drain washer part numbers:
Rear differential gasket x2 803918060
Front Differential gasket 803926090
Transmission gasket 11126AA050

The rear drain plug magnet had a sizable dome of gunk stuck to it. I'm glad I did it when I did.
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Old 04-15-2014, 11:09 PM   #10 (permalink)
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Is the rear drain plug located in the center of the rear axle?
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