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2019 Subaru Impreza front and rear diff oil #5136133 06/16/19 08:08 PM
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xtell Offline OP
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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 08:18 PM
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gathermewool Offline
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Literally any GL-5 oil will be fine.


14 Forester XT Touring FA20DIT (Cobb Stage 1)
Castrol Magnatec 5W-30 D1G2 + FU filter (72,320mi, 8/24/19)
15 Legacy Premium FB25
Magnatec 5W-20 + FU filter (47,300mi, 5/11/19)
Re: 2019 Subaru Impreza front and rear diff oil [Re: gathermewool] #5136175 06/16/19 09:12 PM
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dkryan Offline
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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
Valvoline M-E 5w-30/Fram Ultra

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

2019 Subaru Outback 2.5L Limited
Idemitsu Zeepro 0w-20/Wix XP

Re: 2019 Subaru Impreza front and rear diff oil [Re: dkryan] #5136185 06/16/19 09:31 PM
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xtell Offline OP
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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 04:59 AM
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SubieRubyRoo Offline
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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.


De omnibus dubitandum.
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136324 06/17/19 05:31 AM
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zeng Offline
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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 05:32 AM.
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136361 06/17/19 06:55 AM
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ARCOgraphite Offline
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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#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136445 06/17/19 08:59 AM
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Eddie Offline
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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 09:27 AM
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SubieRubyRoo Offline
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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


De omnibus dubitandum.
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136475 06/17/19 09:37 AM
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FA_WRX Offline
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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
PP Euro L 5W30
WIX 10078

Re: 2019 Subaru Impreza front and rear diff oil [Re: FA_WRX] #5136499 06/17/19 10:24 AM
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jbutch Offline
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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 @ 104k km
Current fill: Pennzoil Euro LX 0w-30 with Fram Ultra XG7317
Re: 2019 Subaru Impreza front and rear diff oil [Re: FA_WRX] #5136532 06/17/19 11:08 AM
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ARCOgraphite Offline
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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 11:11 AM.

2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5136604 06/17/19 12:26 PM
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FA_WRX Offline
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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
PP Euro L 5W30
WIX 10078

Re: 2019 Subaru Impreza front and rear diff oil [Re: Eddie] #5137548 06/18/19 12:30 PM
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gathermewool Offline
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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 Touring FA20DIT (Cobb Stage 1)
Castrol Magnatec 5W-30 D1G2 + FU filter (72,320mi, 8/24/19)
15 Legacy Premium FB25
Magnatec 5W-20 + FU filter (47,300mi, 5/11/19)
Re: 2019 Subaru Impreza front and rear diff oil [Re: xtell] #5137619 06/18/19 02:01 PM
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sw99 Offline
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I use WM St 75-90 GL5 and its just fine. This reminds me to do the OB here soon.




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