Recent Topics
Can I use M1 0w40 in '05 Landcruiser?
by TKNY
12/22/14 09:30 AM
Alignment Tips & Warnings
by SumpChump
12/22/14 09:09 AM
Cheap used car advice
by greenjp
12/22/14 08:31 AM
laptop in checked baggage
by joaks
12/22/14 08:23 AM
Oil Leak Stopped!
by Wingman
12/22/14 07:49 AM
Flight Simulator 2002
by Eddie
12/22/14 06:42 AM
Blown/locked up engine reports due in...
by CourierDriver
12/22/14 06:03 AM
Concept vehicle(s)
by MalfunctionProne
12/22/14 05:57 AM
Should I remove old PS fluid with a spray bottle
by MalfunctionProne
12/22/14 05:33 AM
Motor Week - Goss - filter fumble
by dnewton3
12/22/14 05:24 AM
Seasons Greetings
by Smoky14
12/22/14 05:22 AM
A350 Launch
by KD0AXS
12/22/14 05:02 AM
Newest Members
consolidated, mike_a, dlayman, BRader, GuySir
52259 Registered Users
Who's Online
102 registered (3311, ag_ghost, 3800Series, 1foxracing, 2010_FX4, 97f150, 12 invisible), 1341 Guests and 226 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
52259 Members
66 Forums
223782 Topics
3549299 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#2631051 - 05/19/12 05:50 PM 2000 subaru trans and diff change
jimwards17 Offline


Registered: 03/01/10
Posts: 34
Loc: ny
Just changed out the transmission and rear differential gear fluid on my impreza. Didn't know what was in there before, but I put in supertech 80w-90 conventional. It's GL-5 and "safe for copper and bronze". I plan to leave it in for 25,000 miles. Comments?


Edited by jimwards17 (05/19/12 05:51 PM)
_________________________
2000 Subaru Impreza Outback Sport
2.2L
5 MT

Top
#2631058 - 05/19/12 05:59 PM Re: 2000 subaru trans and diff change [Re: jimwards17]
dparm Online   content


Registered: 04/19/10
Posts: 12587
Loc: Chicago, IL
75w90 GL-5 would've given you a lot of good choices.
_________________________
2011.5 BMW M3 saloon ZCP
der stärkste buchstabe der welt
Castrol Edge Professional TWS 10w60 + Mahle OX 254D3

Top
#2631065 - 05/19/12 06:13 PM Re: 2000 subaru trans and diff change [Re: dparm]
martinq Offline


Registered: 07/22/05
Posts: 1023
Loc: ON, Canada
Yeah I would use a high-quality 75w90 to improve efficiency and reduce temps / wear. I used two bottles of Amsoil SVG 75w90 in the 2002 Forester. Next time will likely use Motul Gear 300 75w90 as it's the highest VI gear oil that I can get my hands on.

Top
#2631067 - 05/19/12 06:15 PM Re: 2000 subaru trans and diff change [Re: dparm]
jimwards17 Offline


Registered: 03/01/10
Posts: 34
Loc: ny
Can't use most gear oils in subaru transmission because it shares fluid with the front differential. Subaru also recommends not to use synthetic gear oil. The fluid has to be safe for the synchros and suitable for the hypoid gears.

Side note: The trans dipstick is reading slightly overfilled. I put in 3.7 quarts which is what the owners manual says. Any cause for concern about it potentially being a little overfilled?
_________________________
2000 Subaru Impreza Outback Sport
2.2L
5 MT

Top
#2631070 - 05/19/12 06:22 PM Re: 2000 subaru trans and diff change [Re: jimwards17]
dparm Online   content


Registered: 04/19/10
Posts: 12587
Loc: Chicago, IL
Originally Posted By: jimwards17
Can't use most gear oils in subaru transmission because it shares fluid with the front differential. Subaru also recommends not to use synthetic gear oil. The fluid has to be safe for the synchros and suitable for the hypoid gears.

Side note: The trans dipstick is reading slightly overfilled. I put in 3.7 quarts which is what the owners manual says. Any cause for concern about it potentially being a little overfilled?


That's different in the MT vs AT.
_________________________
2011.5 BMW M3 saloon ZCP
der stärkste buchstabe der welt
Castrol Edge Professional TWS 10w60 + Mahle OX 254D3

Top
#2631079 - 05/19/12 06:36 PM Re: 2000 subaru trans and diff change [Re: jimwards17]
Eddie Offline


Registered: 12/07/03
Posts: 6851
Loc: Florida, Cape Coral
I chose Mobil 1 75/90 IN MY 2000 Forester. There was no measurable difference in fuel mileage after switching to synthetic gear oil. I ran the synthetic gear oil in my Forester for over 100,000 miles and changed it out at ~ 30,000 mile intervals. You will do just fine with the 80-90 gear oil. I would be interested in seeing a copy of a Subaru statement that states we should not use synthetic gear oil in our transmissions.
_________________________
CX5 Touring 2.5L :-)

Top
#2631131 - 05/19/12 07:57 PM Re: 2000 subaru trans and diff change [Re: dparm]
martinq Offline


Registered: 07/22/05
Posts: 1023
Loc: ON, Canada
Originally Posted By: dparm
That's different in the MT vs AT.

Correct. The AT has the front diff separate from the transmission so you can use a dedicated GL-5 for the diff.

Top