Home

2019 Subaru Impreza front and rear diff oil

Posted By: xtell

2019 Subaru Impreza front and rear diff oil - 06/17/19 02:08 AM

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
Posted By: gathermewool

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 02:18 AM

Literally any GL-5 oil will be fine.
Posted By: dkryan

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 03:12 AM

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.
Posted By: xtell

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 03:31 AM

Sounds good to me. Shell Spirax 75w-90 is going in.
Posted By: SubieRubyRoo

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 10:59 AM

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.
Posted By: zeng

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 11:31 AM

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 .
Posted By: ARCOgraphite

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 12:55 PM

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.
Posted By: Eddie

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 02:59 PM

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
Posted By: SubieRubyRoo

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 03:27 PM

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
Posted By: FA_WRX

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 03:37 PM

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.
Posted By: jbutch

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 04:24 PM

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.
Posted By: ARCOgraphite

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 05:08 PM

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 ...
Posted By: FA_WRX

Re: 2019 Subaru Impreza front and rear diff oil - 06/17/19 06:26 PM

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.
Posted By: gathermewool

Re: 2019 Subaru Impreza front and rear diff oil - 06/18/19 06:30 PM

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]
Posted By: sw99

Re: 2019 Subaru Impreza front and rear diff oil - 06/18/19 08:01 PM

I use WM St 75-90 GL5 and its just fine. This reminds me to do the OB here soon.
Posted By: xtell

Re: 2019 Subaru Impreza front and rear diff oil - 06/19/19 01:45 AM

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.


The vehicle just went over 5,000+ miles. You are correct, I am changing it early but on all of my other vehicles, I've been an "early changer" of factory fluids.
Posted By: xtell

Re: 2019 Subaru Impreza front and rear diff oil - 06/19/19 01:54 AM

Originally Posted by gathermewool
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]


I always make sure I save my receipts and mark down mileage, date of service (what I do or what a repair shop does) and what exactly was done. Several times I have taken one of my vehicles in for dealer service under warranty and every time I've gone and showed my service records if the service related to a warranty claim. My information has been accepted as valid and the warranty work was carried out without issue.
Posted By: izualangel

Re: 2019 Subaru Impreza front and rear diff oil - 06/19/19 12:35 PM

I changed my front diff/trans fluid when the CV shaft needed replacement. After talking with the parts guys at my dealer, I decided to use what they use. The plain old valvoline dino 75w90. Same in the rear diff. Been in there 6 years, and it still looks good when I check it. It's been about 55,000 miles. I have thought about changing ut, but I'll probably wait for a CV shaft to poop out first.
Posted By: gathermewool

Re: 2019 Subaru Impreza front and rear diff oil - 06/19/19 01:38 PM

Originally Posted by xtell
Originally Posted by gathermewool
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)



I always make sure I save my receipts and mark down mileage, date of service (what I do or what a repair shop does) and what exactly was done. Several times I have taken one of my vehicles in for dealer service under warranty and every time I've gone and showed my service records if the service related to a warranty claim. My information has been accepted as valid and the warranty work was carried out without issue.


I don't know if you thought I was questioning your wanting to DIY or if you responded to the wrong person.

I 100% on board with you and agree that anyone can DIY (with the correctly spec'd fluids) and the dealer can not ever deny a warranty claim, unless they prove that you screwed it up. I do all of my own fluid changes, EXCEPT for the CVT, since it's still under the extended 100k-miles warranty.

With that said, you obviously have to be careful. For instance, if you go in for warranty service on your grinding rear diff and they discover the level is not corrected and there are no discernible leaks from the case, the dealer would have a good chance of denying your differential warranty work approval and you'd be on the hook for the whole thing.
Posted By: xtell

Re: 2019 Subaru Impreza front and rear diff oil - 06/21/19 02:43 AM

gathermewool,

Absolutely no issue at all. I was just stating that I've been fortunate enough to have warranty work done and my receipts/records have always been accepted. Several of my relatives went to dealerships for warranty work and they also had receipts/records of work they did themselves on their vehicles and the Dealerships would not do the warranty work because the previous repairs / service (like transmission fluid changes) were not done by a Dealership or Certified Mechanic. Your example of having low fluid level giving the Dealership reason to deny a warranty claim is a very valid point.
Posted By: gathermewool

Re: 2019 Subaru Impreza front and rear diff oil - 06/23/19 02:57 PM

Originally Posted by xtell
gathermewool,

Absolutely no issue at all. I was just stating that I've been fortunate enough to have warranty work done and my receipts/records have always been accepted. Several of my relatives went to dealerships for warranty work and they also had receipts/records of work they did themselves on their vehicles and the Dealerships would not do the warranty work because the previous repairs / service (like transmission fluid changes) were not done by a Dealership or Certified Mechanic. Your example of having low fluid level giving the Dealership reason to deny a warranty claim is a very valid point.



Perfect - just didn't mean to inadvertently offend you.

RE: Low level in diff cause for warranty denial: This might actually be a bad example. If you and I can change the diff fluid ourselves, we can for darned sure check the level before taking it into the dealer.

If any dealer denied warranty service, because I did work myself and had documentation to prove it, they'd better be ready to lose that fight. Again, the only reason I could see them denying a specific component for warranty repair, is if the DIYer did other work that impacted this work.

I think I've got a good example here: if you upgrade your roll bar to one that is thicker than OEM and then take your vehicle in for warranty repair of the endlinks that failed. In this case, they'd have every right to tell you to go pound sand.
Posted By: kr_bitog

Re: 2019 Subaru Impreza front and rear diff oil - 07/15/19 10:20 AM

The original viscosity for EXTRA MT is actually 75w85 GL5
Posted By: PWMDMD

Re: 2019 Subaru Impreza front and rear diff oil - 07/20/19 11:56 AM

Originally Posted by gathermewool
Originally Posted by xtell
gathermewool,

Absolutely no issue at all. I was just stating that I've been fortunate enough to have warranty work done and my receipts/records have always been accepted. Several of my relatives went to dealerships for warranty work and they also had receipts/records of work they did themselves on their vehicles and the Dealerships would not do the warranty work because the previous repairs / service (like transmission fluid changes) were not done by a Dealership or Certified Mechanic. Your example of having low fluid level giving the Dealership reason to deny a warranty claim is a very valid point.



Perfect - just didn't mean to inadvertently offend you.

RE: Low level in diff cause for warranty denial: This might actually be a bad example. If you and I can change the diff fluid ourselves, we can for darned sure check the level before taking it into the dealer.

If any dealer denied warranty service, because I did work myself and had documentation to prove it, they'd better be ready to lose that fight. Again, the only reason I could see them denying a specific component for warranty repair, is if the DIYer did other work that impacted this work.

I think I've got a good example here: if you upgrade your roll bar to one that is thicker than OEM and then take your vehicle in for warranty repair of the endlinks that failed. In this case, they'd have every right to tell you to go pound sand.



I've never understood this attitude by dealerships and some of the reasons I've read for dealerships to deny legitimate warranty work have been ridiculous and impossible for the dealership to prove. Is the hope in denying legit warranty work that the customer will have to reimburse at a higher rate? Why do they care and why wouldn't they be on their customer's side if not just for the goodwill even if it's at al lower rate? This just seems penny wise pound foolish as it usually just results in a [censored] off customer who will no longer purchase or service vehicles at that dealership.
© 2020 Bob Is The Oil Guy