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.
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):
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:
8. Reapply liquid gasket to plugs.
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.