Supertech GL-5 75W90 Synthetic Blend Gear Oil - Subaru Forester Owners Forum
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post #1 of 11 (permalink) Old 11-16-2009, 03:42 PM Thread Starter
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Lightbulb Supertech GL-5 75W90 Synthetic Blend Gear Oil

If label claims can be believed, it is good to see that it has two qualities we need in a GL5 to work well in the Subaru manual trans: No or negligible limited slip friction modifiers ("for top-off...") and protect yellow metals.

I thought it was made by Warren Unilube but it has been pointed out it is made by Warren Performance Products.

$4.97/qt at Wal Mart.


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post #2 of 11 (permalink) Old 11-17-2009, 01:05 AM
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Indeed, specced for trans and not just axles....

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post #3 of 11 (permalink) Old 11-17-2009, 11:44 AM
 
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Hmm, MT-1 is a GL-4 equivalency...

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post #4 of 11 (permalink) Old 11-17-2009, 12:00 PM
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I am a SuperTech motor oil fan. But I'll pass on a semi-syn (Unknown percentage of Group III probably). Worth the difference since Mobil1 is likely Group IV/V. And I can get it at Subaru cheaper than Advance and use my SubaruBucks to boot.

Be careful what you wish for.
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post #5 of 11 (permalink) Old 11-17-2009, 06:02 PM Thread Starter
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adc, the Mobil 1 75W90 gear oil has LS friction modifiers in it. The supertech 75W90 syn blend, I agree most likely a Grp III/II blend. But that should mean the polarity is there for it to stick to the metal well, especially if Grp II is the dominant percentage.

BAC5.2, in my research of gear oils, several GL5's carry the MT-1 rating. The Castrol Syntec GL5 75W90 I have in my rear diff shows MT-1 on the label along with GL5.

Shifting is good right now, but if it goes to hell when the weather gets colder then its on to something else.

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post #6 of 11 (permalink) Old 11-18-2009, 04:59 AM
 
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I think I was mistaken. MT-10 is a GL-4 spec. I must have been thinking about that.

You seem to be pretty motivated to try different gear oils. How many miles does your car have now? Some of the pros/cons you might be attributing to gear oils might, in fact, simply be from synchro "break in". During the first several thousand miles the manufacturing flaws and machining/casting debris is worn off through contact. Improved shift quality comes from that alone, even on factory fill oil.

Have you tried the Motul/Shockproof combo? I urge you to give it a shot. I think you, like everyone else who has tried it, will appreciate the shift quality. I can only think of one person who was dissatisfied with the results they had with that mix... and it turned out to be a broken synchro that was causing his issues.

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post #7 of 11 (permalink) Old 11-18-2009, 06:19 AM
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Quote:
Originally Posted by adc View Post
I am a SuperTech motor oil fan. But I'll pass on a semi-syn (Unknown percentage of Group III probably). Worth the difference since Mobil1 is likely Group IV/V. And I can get it at Subaru cheaper than Advance and use my SubaruBucks to boot.
I have accumulated a few of those $100 Chase Subaru MasterCard certificates.
Can one be used to buy $20 worth of oil, and if so, does the dealer give you $80 change in cash, or does he somehow change the remaining value of the certificate?
Or can a certificate only be used completely, so you would have to buy $100 worth of oil?
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post #8 of 11 (permalink) Old 11-19-2009, 09:30 AM Thread Starter
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Post MSDS for Supertech Synthetic Blend 75W90 GL-5 Gear Oil

Working on getting a Typical Properties sheet as well.
Attached Files
File Type: pdf MSDS.pdf (97.6 KB, 324 views)

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post #9 of 11 (permalink) Old 11-19-2009, 11:35 AM
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I have accumulated a few of those $100 Chase Subaru MasterCard certificates.
Can one be used to buy $20 worth of oil, and if so, does the dealer give you $80 change in cash, or does he somehow change the remaining value of the certificate?
Or can a certificate only be used completely, so you would have to buy $100 worth of oil?
It must be used completely. However, I've had some dealerships give me "credit" for the remainder for future services at their dealership. I usually save them for major parts and emergency repairs.

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post #10 of 11 (permalink) Old 11-19-2009, 01:45 PM
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Originally Posted by Lone Ranger View Post
adc, the Mobil 1 75W90 gear oil has LS friction modifiers in it. The supertech 75W90 syn blend, I agree most likely a Grp III/II blend. But that should mean the polarity is there for it to stick to the metal well, especially if Grp II is the dominant percentage. .
I think the Polarity thing is over-rated honestly (IMHO) I wouldn't expect it to contribute significantly to the big picture. (Just an opinion). FWIW Esters are highly Polar.

Be careful what you wish for.
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post #11 of 11 (permalink) Old 11-20-2009, 11:00 AM Thread Starter
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The Typical Properties sheet

Here is the Typical Properties sheet. I contacted Warren Distribution and was told that Supertech Synthetic Blend 75W90 is the same formulation as their MAG1 Synthetic Blend 75W90.
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File Type: pdf TypicalProperties.pdf (80.5 KB, 294 views)

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