('14-'18) 2.5i 6MT Transmission Fluid Change How To - Subaru Forester Owners Forum
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post #1 of 17 (permalink) Old 09-25-2017, 09:59 AM Thread Starter
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2.5i 6MT Transmission Fluid Change How To

Hey Guys,

Figured I'd do a little write up for anyone who's looking to change the gear oil on their 2014+ 6MT. There's a lot of information dispersed out there and I'm hoping this will serve the next person gathering bits and pieces to do this themselves (like I had to do).

For starters, you'll need:
- Ramps to prop up the front of the car (not absolutely necessary but it will save you some time with the plastic shield underneath the car).
- 4 liters of Motul 300 gearbox oil 75w90 (I got 5 but 4 is enough)
- Subaru Drain Plug Gasket (I could have reused mine but spending $5 on a new one is cheap insurance).
- Liquid Gasket
- 1/2 inch drive wrench
- T-70 bit
- 12mm socket
- Goose neck funnel.
- 3 beers.

I tried to grab as many pics as I could but did not do so while I was underneath the car. Not a big deal. there's only so many plugs that you can unscrew.

1. Start by raising the front of the vehicle onto the ramp so that you can remove the plastic shield underneath. There should be 4 bolts and 2 plastic clip things Subaru loves so much.
[IMG][/IMG]

2. Once the cover is removed, lower the car back down and make sure the surface you are on is level. Go underneath the car with your T70 bit and a drain pan and unscrew the front differential drain plug (there's only one plug under that will fit the T70 bit - you can't really go wrong. CAUTION: The gear oil that comes out may be hot if you drove the car recently so be careful. The oil that came out of mine was a little hotter than warm, but I didn't line up the drain pan and made a small mess...

3. have a beer and let it drain.

4. Put the drain plug w/ new gasket on and torque it down.

5. Refilling the transmission fluid is what took me the longest because I couldn't find the tranny fluid dipstick... It's under the hood, behind the air intake, passenger side, hidden behind a wiring harness. Here are some pictures to help you find it. Note that I took off the air intake pipe for easy access (that's what we'll call it for now):
[IMG][/IMG]
[IMG][/IMG]
[IMG][/IMG]
I put 3 full bottles of gear oil + 150 mL (manual says 3.3quarts).

6. Put everything back together and head to the rear differential. Rear diff has 2 plugs, one drain, and one overfill (the top one). Take your drain pan, remove the top plug first, followed by the drain plug and let it flow out.

7. Have another beer and go clear your plugs.
Wipe metal shavings off from the magnet and get all the liquid gasket that was previously applied outta there. I used a tooth pick. Here are before and after pics:
[IMG][/IMG]
[IMG][/IMG]

8. Reapply liquid gasket to plugs.
[IMG][/IMG]

9. Put the drain plug back on and torque it down. Be careful not to get the liquid gasket everywhere.

10. Grab your last bottle of gear oil and fill the top hole until oil starts dripping out. When it does, it's full. Put top plug back on, torque it down. Motul 300 gear oil containers have a little pop out tube which makes this super easy.

11. Have a beer and pat yourself on the back. You did it!

At this point I let the car run idle for 10 minutes and took it for a test drive. Everything ran like butter so I lifted it back up on the ramp and reinstalled the plastic cover underneath the front diff.

Things I'd do different:
- Start with the back, I couldn't get all of the gear oil out of the bottle by squeezing it and had to use 2 bottles (got about half of each in) and then consolidated the remainder into 1 bottle (which is now sitting on a shelf for the next time I do this in ~ 2 years.

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Last edited by BenDerisgreat; 09-25-2017 at 10:24 AM.
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post #2 of 17 (permalink) Old 09-25-2017, 10:03 AM Thread Starter
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Trying to get pictures to upload... plz hold...

EDIT: There we go!


Last edited by BenDerisgreat; 09-25-2017 at 10:24 AM.
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post #3 of 17 (permalink) Old 09-26-2017, 05:37 PM
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The sweet smell of gear lube.

Brings back fond memories of my '72 Vega.
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post #4 of 17 (permalink) Old 09-26-2017, 05:54 PM
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Quote:
Originally Posted by BenDerisgreat View Post
Trying to get pictures to upload... plz hold...

EDIT: There we go!
Hmmm... all I see are photobucket place-markers instead of pics.

Mike
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post #5 of 17 (permalink) Old 10-04-2017, 11:49 AM Thread Starter
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Hmmm... all I see are photobucket place-markers instead of pics.

Mike
Awww bummer! I had it working but apparently photobucket wants to charge me a $399 upgrade to host images on 3rd party websites... :(
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post #6 of 17 (permalink) Old 10-04-2017, 05:04 PM
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Originally Posted by BenDerisgreat View Post
Awww bummer! I had it working but apparently photobucket wants to charge me a $399 upgrade to host images on 3rd party websites... :(
Apparently you aren't the only one! There's a 10-page thread on this at:

https://www.subaruforester.org/vbulle...-block-705178/

I don't use photobucket, so I didn't read it thoroughly, but just skimming toward the end of the thread seems to indicate that there may be a temp work-around, if you're interested.

Mike
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post #7 of 17 (permalink) Old 10-05-2017, 06:42 AM Thread Starter
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Quote:
Originally Posted by subatron View Post
Apparently you aren't the only one! There's a 10-page thread on this at:

https://www.subaruforester.org/vbulle...-block-705178/

I don't use photobucket, so I didn't read it thoroughly, but just skimming toward the end of the thread seems to indicate that there may be a temp work-around, if you're interested.

Mike
Bastards! I'll read thru the thread and will try and update pictures this weekend. The main shot I want to show is how I refilled the front diff / transmission since it took me so long to find it (not rocket science but I am an amateur after all...)

Thanks for the info!
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post #8 of 17 (permalink) Old 10-05-2017, 07:50 AM
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Guys, just run the photobucket patch on your browsers. It's a free workaround that hasn't failed me yet


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post #9 of 17 (permalink) Old 10-05-2017, 11:25 AM Thread Starter
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Guys, just run the photobucket patch on your browsers. It's a free workaround that hasn't failed me yet
It works!!!!! Saved me 10 minutes of reading which I will spend applying my Winter wax this weekend.

You da man!
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post #10 of 17 (permalink) Old 02-11-2019, 05:29 PM
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So, I am assuming that the 6MT manual transmission AND the front differential share the same 3.3 quarts of GL-5 75w90 fluid? Is that correct?

On one Youtube video I watched about changing the 6MT transmission oil, it had TWO plugs to open for draining--one 21mm plug for the tranny, and one 14mm plug for the front diff. Only the tranny plug had a magnet on it. Is there one or two plugs to open?

It looked like the transmission/front differential shared the same refill point--the transmission dipstick located at the top, under the wiring harness.

I have a 2015 Forester with the 6MT manual.


Last edited by krbaylor; 02-11-2019 at 05:55 PM.
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post #11 of 17 (permalink) Old 02-19-2019, 06:05 PM
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Quote:
Originally Posted by krbaylor View Post
So, I am assuming that the 6MT manual transmission AND the front differential share the same 3.3 quarts of GL-5 75w90 fluid? Is that correct?

On one Youtube video I watched about changing the 6MT transmission oil, it had TWO plugs to open for draining--one 21mm plug for the tranny, and one 14mm plug for the front diff. Only the tranny plug had a magnet on it. Is there one or two plugs to open?

It looked like the transmission/front differential shared the same refill point--the transmission dipstick located at the top, under the wiring harness.

I have a 2015 Forester with the 6MT manual.
The service manual for the 2014 6MT shows a single drain plug and its a T-70 Torx drain plug. Fill is through the dipstick. The front differential shares the fluid with the transmission.

The CVT has multiple drain plugs, for both diff oil and CVT fluid.
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post #12 of 17 (permalink) Old 06-08-2019, 02:51 PM
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Sorry for reviving an old thread, but in the 6MT, are the front diff/ trans and the rear diff separated? I just did my front diff/transmission a month ago and used I used Redline 75W90ns. I guess I forgot to do the rear. Is it okay to use another brand for the rear diff?
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post #13 of 17 (permalink) Old 06-08-2019, 03:28 PM
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Yes the rear diff is a separate component and yes it's OK to use another brand.

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post #14 of 17 (permalink) Old 06-08-2019, 04:28 PM
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Thanks. That's a relief
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post #15 of 17 (permalink) Old 06-22-2019, 09:07 AM
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Front drain plug gasket p/n is 803926090 26.3 x 32.3 x 1 , $2.48 at my local dealer


Tightening torque:
44 N·m (4.5 kgf-m, 32.5 ft-lb) (aluminum gasket, silver)
70 N·m (7.1 kgf-m, 51.6 ft-lb) (copper gasket, brown)
70 N·m (7.1 kgf-m, 51.6 ft-lb) (metal gasket, black)
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