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Old 02-11-2008, 12:19 PM   #1 (permalink)
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GL5 in the t-176

I have read everywhere that GL5 will eat brass bushings/synchros because of the high sulfur content. I mistakenly put in GL5 the other week when I put the rebuilt transmission in and it ran fine. I let it sit for a week and now it grinds when I have it in 4th gear pretty bad. It is obviously my mistake, but how fast does this stuff actually eat synchros?
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Old 02-11-2008, 04:13 PM   #2 (permalink)
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Well, if you still have the bottles you'll want to check and see if the GL-5 has the MT-1 designation or not. GL-5/MT-1 is syncro friendly and was reformulated soon after the whole GL-5 issue came up.

Otherwise, it's hard to say how fast your syncro's will be damaged. You'll have to drain it and check for gold.
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Old 02-11-2008, 04:57 PM   #3 (permalink)
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Now when you say, MT-1 is syncro friendly does that mean brass/bronze syncros, like in the AX-15>
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Old 02-11-2008, 05:04 PM   #4 (permalink)
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Yes, MT-1 designation means it's safe with yellow metals like copper and brass, ie. syncros.
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Old 02-12-2008, 06:21 AM   #5 (permalink)
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Yeah

If you trackdown the Amsoil white paper on gear oils, they actually run the copper corrosivity test on a bunch of GL5s. Most of them pass just fine. I believe the GL5 spec isn't required to pass that test. Doesn't mean it won't, doesn't mean the manufacturer didn't do it, just that it isn't in the spec.
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Old 02-12-2008, 06:31 AM   #6 (permalink)
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Yeah

If you trackdown the Amsoil white paper on gear oils, they actually run the copper corrosivity test on a bunch of GL5s. Most of them pass just fine. I believe the GL5 spec isn't required to pass that test. Doesn't mean it won't, doesn't mean the manufacturer didn't do it, just that it isn't in the spec.

I wouldn't rely on the MT-1 spec to tell you anything. In fact, it is intended for transmissions that are non synchronized. I can't find the tests it has to pass for the MT-1 spec so...

A GL4 is what you want.
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Old 02-12-2008, 06:33 AM   #7 (permalink)
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Okay

According to Amsoil

Quote:
Also, both MT-1 and MIL-PRF-2105E require a
more severe cooper corrosion test (ASTM D-130) than
MIL PRF-2105D.
It looks like the MT-1 does incorporate the D-130 test.
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Old 02-12-2008, 08:22 AM   #8 (permalink)
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Quote:
Originally Posted by atblis View Post
If you trackdown the Amsoil white paper on gear oils, they actually run the copper corrosivity test on a bunch of GL5s. Most of them pass just fine. I believe the GL5 spec isn't required to pass that test. Doesn't mean it won't, doesn't mean the manufacturer didn't do it, just that it isn't in the spec.

I wouldn't rely on the MT-1 spec to tell you anything. In fact, it is intended for transmissions that are non synchronized. I can't find the tests it has to pass for the MT-1 spec so...

A GL4 is what you want.
Hmm, interesting. I looked up the Amsol test for Gear oils. (nice find.) http://www.amsoil.com/lit/g2457.pdf

This is probably the one you're referring to.

Mopar, Royal Purple and Lucas didn't pass but all of the others did. Page 17.
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Old 02-12-2008, 03:03 PM   #9 (permalink)
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i don't see how the GL-5 could "eat" synchros in a week

even the whole theory about it causing damage to synchros is hard for me to fathom but WTF do i know. i can say though that my AX15 works so much better with pennzoil synchromesh instead of the GL-5 75-90 shit. i might attribute to the pennzoil seeming a bit lighter weight than 75-90 even though i read it to be 80w. can't believe everything you read/hear

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Old 02-12-2008, 05:02 PM   #10 (permalink)
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Well

What brand of GL5 were you running?

It varies. I've heard rumours of failures within maybe 5-10 k miles. Not weeks though.

It appears that most GL5s are fine for brass synchros. That's probably what makes this whole thing so confusing.
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