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Subaru High Performance Gear Oil vs Subaru Extra S #3542290 11/19/14 01:44 PM
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bluesubie Offline OP
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These VOA’s are courtesy of JarHams on nasioc and are posted in the Car Part Reviews forum there.

The main reason for the voa’s is because Subaru of America sent a letter to dealers stating that the HPGO 75W-90 “is available as an alternative to the current K0322AA093 75W-90 Go Extra S Gear Oil that is supplied in a 5 Gallon Pail”, while inquiries to SoA by some customers (and even some dealers) claimed that it was the same product. Although the Extra S is made by Showa Shell Sekiyu and the HPGO is made by Idemitsu. Dealers have access to the MSDS, so maybe it will eventually show up soon on-line.

Both samples dated 1 Nov 2014

Extra S
(Similar to what we’ve already seen)

Boron 361
Silicon 4
Calcium 1178
Magnesium 988
Phosphorous 1173

Properties

cSt Viscosity @ 100C 13.34
Flashpoint: 400
TAN: 4.8

Comments: This is the sample of Extra S sample of 75W/90. The additives present are boron, calcium, magnesium, and phosphorus. The viscosity is correct for 75W/90 and there’s no moisture or insoluble present. The TAN is 4.8. This is serviceable oil.

Subaru High Performance Gear Oil
(hey, who took my metallic additives?)

Boron 124
Silicon 6
Phosphorous 902

Properties

Viscosity @ 100C 15.04
Flashpoint: 425
TAN: 3.4

Comments: This is the sample of the High Performance 75W/90. The additives are very different from the Extra S, so this is not the same oil. That’s not to say that one is better than the other or that this oil isn’t serviceable, but the two aren’t the same. No moisture or insolubles are present. The TAN is 3.4.

Is there any chance that sulfur in the HPGO is higher than in the Extra S?

popcorn

-Dennis


Last edited by bluesubie; 11/19/14 01:58 PM.
Re: Subaru High Performance Gear Oil vs Subaru Extra S [Re: bluesubie] #3542384 11/19/14 04:13 PM
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Bandito440 Offline
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I've got the HPGO in my Forester now. It shifts like it did originally, for whatever that's worth. I tried Amsoil 75w-110, which was very poor, and a waste.


'14 Grand Cherokee EcoDiesel
Rotella T6 5w-40 & OEM filter
Re: Subaru High Performance Gear Oil vs Subaru Extra S [Re: bluesubie] #3542446 11/19/14 05:05 PM
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oaklandish_wrx Offline
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Thanks for evangelizing, Dennis!


'02 Subaru WRX, Shell RT6, PO 14460; Scotty's cocktail, 75W90 synth in diff

'03 Matrix XR, MaxLife 10W30/40, OCOD PE4386, Castrol T-IV Synth ATF
Re: Subaru High Performance Gear Oil vs Subaru Extra S [Re: bluesubie] #3542458 11/19/14 05:25 PM
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buster Offline
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Thanks Dennis. It appears the Subaru HPGO is using a more modern additive system. I have no idea if it's as good or not.

What do Subaru racing teams use? Is Extra-S still preferred by the track guys? If so I'd go with that still.


2019 Frontier Pro 4X - RGT 5w30
2019 Impreza Sport - OE fill
Re: Subaru High Performance Gear Oil vs Subaru Extra S [Re: buster] #3542473 11/19/14 05:38 PM
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bluesubie Offline OP
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Originally Posted By: buster

What do Subaru racing teams use? Is Extra-S still preferred by the track guys? If so I'd go with that still.

When I toured Vermont Rally Car a year ago, they had plenty of Motul Gear 300 on hand. Now they're sponsored by RP and most people don't have many good things to say about their gear oil in a Subaru. Different gearbox in the rally cars though.

And with the introduction of HPGO, I don't believe SoA/dealers will even be getting those pails of Extra S any longer.

Lol, oaklandish. Thanks for pointing out this voa to me on nasioc!

-Dennis


'20 Subaru Outback Onyx XT | FF Idemitsu 0W-20
'04 Subaru Forester 2.5XT | Edge 0W-40
Re: Subaru High Performance Gear Oil vs Subaru Extra S [Re: bluesubie] #3542556 11/19/14 06:55 PM
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Pablo Offline
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What is OEM in 2014 WRX? It sure went to heck under 1500 miles! Every shift was a real grind. I drained and slightly overfilled with Amsoil SVT 75W-110 headed to 8k miles now and still great. All shifts are like butter now. Bill in Utah and others have been using the 110 for years now.


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


Re: Subaru High Performance Gear Oil vs Subaru Extra S [Re: Pablo] #3542880 11/20/14 06:46 AM
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bluesubie Offline OP
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Originally Posted By: Pablo
What is OEM in 2014 WRX? It sure went to heck under 1500 miles! Every shift was a real grind.

I've read all sorts of things, but since Idemitsu makes the factory fill engine oil and the new HPGO is also made by Idemitsu, my guess is that it is possibly now made by Idemitsu.

It's probably better than the Mobil Conventional 80W-90 that my dealer uses. You need a sledge hammer to shift with that stuff when it's below freezing outside!

-Dennis

Last edited by bluesubie; 11/20/14 06:47 AM.

'20 Subaru Outback Onyx XT | FF Idemitsu 0W-20
'04 Subaru Forester 2.5XT | Edge 0W-40
Re: Subaru High Performance Gear Oil vs Subaru Extra S [Re: bluesubie] #3557119 12/05/14 09:59 PM
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MolaKule Offline
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The Extra S appears to be a true 75W90 MTL, while the Subaru High Performance Gear Oil appears to be a run-of-the-mill differential lube.


"Dr. Larry Fleinhardt:
You know that it's considered unsolvable?
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Well, certainly people who have failed to solve it might think that." From NUMB3RS
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