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Subaru Extra MT Alternatives? #5005753 02/09/19 12:39 PM
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Clarkbug Offline OP
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Good afternoon Everyone.

I did a little searching on this, but didnt see any definite conclusions anywhere.

I have a Subaru Forester with the 6MT, and I see in the manual it states to use Subaru Extra MT. (Not to be confused with Extra-S, or the HPGO. Here is a handy link: https://content.subarunet.com/snet/_content/fixed_operations/oil_program/mt_gear_oils.pdf )

I know there is an option to use a GL5 75w-90, but also know the transmissions are a little bit picky about what goes in them it seems, and its hard to get a good match of protection for the diff as well as the synchros. Is OEM the way to go here, or is there an Amsoil/Motul/Delvac alternative that should keep things happy?

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5005766 02/09/19 12:46 PM
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maxdustington Offline
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Redline, or ask on a Sube board.


99 Toyota Tercel CE 5EFE/C151
Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5005811 02/09/19 01:34 PM
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XCIDMigs Offline
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Motul, its 100% synthetic and sold in 4 packs on ebay..... Put in my WRX at 35k shifts like butter

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5005837 02/09/19 01:54 PM
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slacktide_bitog Offline
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Redline 75w90NS

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5005903 02/09/19 03:02 PM
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Rand Offline
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I like redline 75w90ns
but the motul gear 300 was better.

Shifts better except in extreme cold vs the oem.

IIRC Need 4liters uses just over 3.25qt


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5005920 02/09/19 03:29 PM
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SubieRubyRoo Offline
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I've tried the Redline 75W90NS, and while good, it was not as good as the Motul Gear 300.

The Motul is what I use in every Subaru diff I own or service (that number is now at 9 vehicles and counting); for 4EATs I use MaxLife ATF in the tranny but still Motul in the diffs. It's worth every penny.

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5005941 02/09/19 04:15 PM
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FA_WRX Offline
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My WRX also states Subaru Extra MT. I have used Subaru 75W 90 high performance gear oil instead. Changed two times changes were at about 35K intervals. The car is at 75k now no issues.

Last edited by FA_WRX; 02/09/19 04:38 PM.

2015 WRX FA20F
PP 5W30
Napa Gold 100078

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5005961 02/09/19 04:42 PM
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Motul Gear 300 75W90

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5006028 02/09/19 05:58 PM
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y_p_w Offline
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It's been a while, but I remember back when Subaru's recommendation was solely for GL-5 75W90. I'd tried all sorts of lubes including Red Line 75W90NS and Motul Gear 300. I did have this really odd reverse gear failure back in 2010 but I can't attribute that to the gear lube. Someone I know actually rebuilt it because he couldn't find a used or rebuilt transmission and handed me the reverse idler gear that had a couple of broken teeth as well as a few bent ones. Said it was highly unusual for straight gears to break. But he had access to Special S and I believe that's what's still in there. I haven't bothered to change it since since I'm kind of lazy and technically they only say to inspect it and change if there's an issue. It's not low so I haven't done anything. Shifts are still good. I'd like to change it again if I could get Special S, but not sure if it's still available and I can't find my tools - especially that oddball T-70 Torx bit. Do they still use that?

Re: Subaru Extra MT Alternatives? [Re: maxdustington] #5006151 02/09/19 07:35 PM
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Clarkbug Offline OP
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Originally Posted by y_p_w
It's been a while, but I remember back when Subaru's recommendation was solely for GL-5 75W90. I'd tried all sorts of lubes including Red Line 75W90NS and Motul Gear 300. I did have this really odd reverse gear failure back in 2010 but I can't attribute that to the gear lube. Someone I know actually rebuilt it because he couldn't find a used or rebuilt transmission and handed me the reverse idler gear that had a couple of broken teeth as well as a few bent ones. Said it was highly unusual for straight gears to break. But he had access to Special S and I believe that's what's still in there. I haven't bothered to change it since since I'm kind of lazy and technically they only say to inspect it and change if there's an issue. It's not low so I haven't done anything. Shifts are still good. I'd like to change it again if I could get Special S, but not sure if it's still available and I can't find my tools - especially that oddball T-70 Torx bit. Do they still use that?


You cannot get Extra-S anymore, so unless you find someone with part of a pail left, you are out of luck. I believe its still the Torx bit, but might be different depending on your year.

Originally Posted by SubieRubyRoo
I've tried the Redline 75W90NS, and while good, it was not as good as the Motul Gear 300.

The Motul is what I use in every Subaru diff I own or service (that number is now at 9 vehicles and counting); for 4EATs I use MaxLife ATF in the tranny but still Motul in the diffs. It's worth every penny.


Thanks for the advice, thats good to know. I have heard good things, but wasnt sure how it behaved in the 6 speed.

Originally Posted by maxdustington
Redline, or ask on a Sube board.


You know how oil threads go. Thats why I figured I would ask on an oil board. Plus the most active seems to be NASIOC, and I dont want their snark or to hear about Uncle Scotty's Cocktail any more.

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5006223 02/09/19 08:37 PM
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SubieRubyRoo Offline
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Uncle Scotty's Cocktail worked more like Uncle Scotty's Craptail the one and only time I ever tried that mess. No thanks!

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5006235 02/09/19 08:52 PM
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Pablo Offline
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Amsoil 75W-90 in cold places, Amsoil 75W-110 in warm places.

Amsoil 75W-90

Amsoil 75W-110


DIRECT JOBBER - PABLO - for all your Amsoil needs
http://oilslubesandfilters.shopamsoil.com/


Re: Subaru Extra MT Alternatives? [Re: Pablo] #5009821 02/13/19 11:00 AM
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Clarkbug Offline OP
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Originally Posted by Pablo
Amsoil 75W-90 in cold places, Amsoil 75W-110 in warm places.

Amsoil 75W-90

Amsoil 75W-110



I am definitely in a cold place.

Looks like it comes down to Redline, Amsoil, or Motul as options if I dont want to spend the $$$ at the Dealer for a five gallon pail.

Does anyone know if Idemitsu is still making this for Subaru?

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5015354 02/18/19 02:29 PM
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Clarkbug Offline OP
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So I have done some more searching, and came across motylgear, which appears to be a semi-syn. I see they have a 75w-80 grade, and I wonder if that would be comparable to the Extra-MT...

Re: Subaru Extra MT Alternatives? [Re: Clarkbug] #5015391 02/18/19 03:03 PM
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y_p_w Offline
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Originally Posted by Clarkbug
Does anyone know if Idemitsu is still making this for Subaru?

As far as I know the US dealers can't get Extra S any more. What they have now is part # SOA427V1700, which says "Certified High Performance Gear Oil 75W90" and is made by Idemitsu.

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