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2019 Subaru Impreza front and rear diff oil #5136133
06/16/19 09:08 PM
06/16/19 09:08 PM
Joined: Dec 2006
Posts: 612
ohio
xtell Offline OP
xtell  Offline OP

Joined: Dec 2006
Posts: 612
ohio
Vehicle: 2019 Subaru Impreza 2.0i 5-door, automatic,

I'm going to be changing the GF's Subaru front and rear differential oil. The Owners Manual states " Subaru Extra MT GL-5 75W-90" as the appropriate fluid to use. I can get quarts of Shell Spirax S6 AXME 75W-90 Synthetic Gear Oil at at really good price. Would this specific gear oil be suitable for these differentials. I have used Spirax gear oil and Valvoline SynPower 75W-90 gear oil in the differentials of my personal vehicles and work trucks without issue. Are Subaru differentials "picky" as to what weight or brand of gear oil works best in them. I've checked on various Subaru Forums and recommendations for gear oil vary greatly. Any input the the BITOG Subaru Owners out there would be appreciated.

xtell

Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136137
06/16/19 09:18 PM
06/16/19 09:18 PM
Joined: Jan 2009
Posts: 7,217
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 7,217
New England
Literally any GL-5 oil will be fine.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Magnatec 5W-20 + FU filter (47,300 miles)
Re: 2019 Subaru Impreza front and rear diff oil [Re: gathermewool] #5136175
06/16/19 10:12 PM
06/16/19 10:12 PM
Joined: Apr 2003
Posts: 2,093
Cincinnati
dkryan Offline
dkryan  Offline

Joined: Apr 2003
Posts: 2,093
Cincinnati
Originally Posted by gathermewool
Literally any GL-5 oil will be fine.


Yep. +1

I will change out the gear lube in the front and rear diffs at 10k on our 2019 Outback. I will use Amsoil Severe Gear 75w-90 in both diffs. No worries.


2014 Nissan Altima 2.5 SL
Shell T/SUV 5w-30/Fram Ultra

2005 Toyota Highlander 3.3L
Pennzoil Ultra 5w-30/Fram Ultra filter

2019 Subaru Outback 2.5L Limited
Pennzoil Platinum 0w-20/Wix XP filter

Re: 2019 Subaru Impreza front and rear diff oil [Re: dkryan] #5136185
06/16/19 10:31 PM
06/16/19 10:31 PM
Joined: Dec 2006
Posts: 612
ohio
xtell Offline OP
xtell  Offline OP

Joined: Dec 2006
Posts: 612
ohio
Sounds good to me. Shell Spirax 75w-90 is going in.

Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136307
06/17/19 05:59 AM
06/17/19 05:59 AM
Joined: May 2012
Posts: 2,987
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline

Joined: May 2012
Posts: 2,987
The land of USA-made Subies!
My favorite is Motul Gear 300, goes into every Subaru differential I own/service (total count is somewhere around 24 differentials). Amsoil SVG is an excellent lube as well.

I don't have any experience with Spirax but as long as it meets GL-5 and is 75W90 it should be ok.

Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136324
06/17/19 06:31 AM
06/17/19 06:31 AM
Joined: Sep 2015
Posts: 2,633
Malaysia
zeng Offline
zeng  Offline

Joined: Sep 2015
Posts: 2,633
Malaysia
Originally Posted by xtell
Sounds good to me. Shell Spirax 75w-90 is going in.

Go for it without any hesitation .
It had 'additional' strong approvals in J2360, MT-1 .

Last edited by zeng; 06/17/19 06:32 AM.
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136361
06/17/19 07:55 AM
06/17/19 07:55 AM
Joined: May 2009
Posts: 13,094
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline

Joined: May 2009
Posts: 13,094
N.H, U.S.A.
Supertech 75W90 in the rear no problems in a year. under 6 bucks a quart. I did feel queasy putting such a thin oil in, being used to SAE 90 GL5 in the old days. But that was in 2 1/2 tonne luxury barges or Killer muscle cars, Plus when Nissan service put 80w90 Mobil HD Plus in the old 2014 Nissan Rogues, the Nissan diffs hated the stuff. Terrible in that application.

Its a light Light Duty diff in a crosstrek. No need for fancy stuff, the "stinky" additives are the magic in gear oil.


2019 VW Jetta S 6MT OCI#0 5033mi-Castrol Edge Prof? VW508+OE Filter; '17 Subaru Crosstrek CVT OC#7 52665mi-Castrol GTX Magnatec 5W20 + SOA Filter
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136445
06/17/19 09:59 AM
06/17/19 09:59 AM
Joined: Dec 2003
Posts: 10,354
Florida, Cape Coral
Eddie Offline
Eddie  Offline

Joined: Dec 2003
Posts: 10,354
Florida, Cape Coral
Hmm. said vehicle is a new 2019 and you don't want to use the factory approved gear lube. Do you have a legitimate reason to dump the warranty if you have gear problems? Ed


2014 CX5 Touring 2.5L :-)
Re: 2019 Subaru Impreza front and rear diff oil [Re: Eddie] #5136467
06/17/19 10:27 AM
06/17/19 10:27 AM
Joined: May 2012
Posts: 2,987
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline

Joined: May 2012
Posts: 2,987
The land of USA-made Subies!
Originally Posted by Eddie
Hmm. said vehicle is a new 2019 and you don't want to use the factory approved gear lube. Do you have a legitimate reason to dump the warranty if you have gear problems? Ed


When was the last time you saw of a differential failure on a stock, non-turbo Subaru? I'll wait for your response while you don't find any... the Subaru diffs are actually extremely durable, short of running them without fluid or until the WRX guys subject them to repeated clutch drops at redline.

Page 12-6 of the OM shows all the diffs need is a GL-5 75W90 gear oil, so nothing special there.
2019 Crosstrek OM

Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136475
06/17/19 10:37 AM
06/17/19 10:37 AM
Joined: Jan 2019
Posts: 111
Pennsylvania
FA_WRX Offline
FA_WRX  Offline

Joined: Jan 2019
Posts: 111
Pennsylvania
curious as to why you would change the OEM fluid so early. I've been doing mine at about 30K intervals. Used OEM fluid no issues.


2015 WRX FA20F
QSUD 5W-30
Tokyo Roki 15208AA170 filter

Re: 2019 Subaru Impreza front and rear diff oil [Re: FA_WRX] #5136499
06/17/19 11:24 AM
06/17/19 11:24 AM
Joined: Jun 2017
Posts: 204
Canada
jbutch Offline
jbutch  Offline

Joined: Jun 2017
Posts: 204
Canada
Originally Posted by FA_WRX
curious as to why you would change the OEM fluid so early. I've been doing mine at about 30K intervals. Used OEM fluid no issues.


Break in materials stays in the oil until the first oil change and since there are no filters on the differentials, they usually depend on a magnetic drain plug to catch what it can.

It's never a bad idea to dump early IMO.


2015 Forester XT @ 92000km
Current fill: Mobil ESP Formula 5w-30 with Fram Ultra XG7317
Re: 2019 Subaru Impreza front and rear diff oil [Re: FA_WRX] #5136532
06/17/19 12:08 PM
06/17/19 12:08 PM
Joined: May 2009
Posts: 13,094
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline

Joined: May 2009
Posts: 13,094
N.H, U.S.A.
Originally Posted by FA_WRX
curious as to why you would change the OEM fluid so early. I've been doing mine at about 30K intervals. Used OEM fluid no issues.

Curious to why you are doing 30K intervals. Usually after a 15-30K mile intial change its lifetime or every 120K there after - unless you are submerging the axle. More d&f may not be better when it comes to diff fluid.
At least some old greasy guy with a limp told me so 50 years ago ...

Last edited by ARCOgraphite; 06/17/19 12:11 PM.

2019 VW Jetta S 6MT OCI#0 5033mi-Castrol Edge Prof? VW508+OE Filter; '17 Subaru Crosstrek CVT OC#7 52665mi-Castrol GTX Magnatec 5W20 + SOA Filter
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136604
06/17/19 01:26 PM
06/17/19 01:26 PM
Joined: Jan 2019
Posts: 111
Pennsylvania
FA_WRX Offline
FA_WRX  Offline

Joined: Jan 2019
Posts: 111
Pennsylvania
I just figured it would not hurt. Fresh fluid in my opinion couldn't hurt. Maybe it does have a negative effect I would not know.


2015 WRX FA20F
QSUD 5W-30
Tokyo Roki 15208AA170 filter

Re: 2019 Subaru Impreza front and rear diff oil [Re: Eddie] #5137548
06/18/19 01:30 PM
06/18/19 01:30 PM
Joined: Jan 2009
Posts: 7,217
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 7,217
New England
I'm all for going for the best when it comes to some fluids, but only if there's a reason. For instance, I plan to dump the factory fill and add Motul Gear 300 in both my Forester XT and Legacy, then not change the lube again for a LONG time, if ever again.

Dumping expensive (~$20/L) lube often seems pretty foolish in such LIGHT, LIGHT, LIGHT duty applications. Might as well just use ST, if you want to drain it every 30k miles.

Originally Posted by Eddie
Hmm. said vehicle is a new 2019 and you don't want to use the factory approved gear lube. Do you have a legitimate reason to dump the warranty if you have gear problems? Ed


What in the world would make you think the warranty will be dumped???

From the 2019 Impreza owner's manual, the only requirement is that the gear oil have an API classification GL-5 (75W-90)
-----90 is also allowed above freezing (i.e., N/A for the vast majority of Subaru owners)



[Linked Image]


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Magnatec 5W-20 + FU filter (47,300 miles)
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5137619
06/18/19 03:01 PM
06/18/19 03:01 PM
Joined: Mar 2006
Posts: 2,452
in the shop
sw99 Offline
sw99  Offline

Joined: Mar 2006
Posts: 2,452
in the shop
I use WM St 75-90 GL5 and its just fine. This reminds me to do the OB here soon.


2008 Toyota Corolla CE 1.8L
2016 Nissan Versa S 1.6L
2018 Subaru Outback 2.5i
2019 Ford F250 6.7L CCSB

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