'99 Transaxle Fluid - Hyundai Forums : Hyundai Forum
 
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#1 Old 09-24-2012, 04:50 PM
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'99 Transaxle Fluid

I have a '99 Accent with a manual transmission. I recently found a tear in one of my cv boots and caught it early enough that the cv was still good. So I drained the transaxle and replaced the outer boots on both cv's (the other looked like it was going to tear soon too). I have come to the conclusion that it requires GL4 gear oil preferably 75W-90. Well I searched all over my town and could only find AMSoil in GL4 and at $17/qt, that is a bit too pricey for my little beater car. Anything wrong with just running some synthetic 75W-90 GL5 instead?

Thanks
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#2 Old 09-24-2012, 05:07 PM
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GL4 for a reason...

GL5 will ruin your brass syncro rings.

Hyundai or Kia dealer - 08950-00020

Redline off a GL4 synthetic that is highly praised in the Accent forum

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#3 Old 09-24-2012, 06:10 PM
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Besides shifting poorly, what bad side effects will there be from ruining the synchro rings?
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#4 Old 09-24-2012, 08:54 PM
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I don't see a way to edit my posts, but I put the GL5 in anyway. It is SuperTech Synthetic 75W-90 GL5 gear oil. I did so based on this comment here "Most of the modern GL-5 lubes contain metal deactivators that prevents attacks by the extreme-pressure additives." from this: Gear Tribology and Lubrication - Part I - Bob Is The Oil Guy

From what I understand if it is GL5-MT1 then it should be safe on bronze and the SuperTech is MT1. It even says on the back of the bottle that it "helps prevent corrosion of copper and bronze." (Although who knows if you can trust advertising anymore)

Guess I'll find out what happens in time. I think my 3rd gear syncho is already bad anyway, it grinds a little when shift from 2nd to 3rd everytime.
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#5 Old 02-02-2013, 02:56 AM
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i put gl-5 in mine recently. wasnt aware there was too much difference, walked in and got any old thing that said gear oil and was cheap.
my gear box is already stuffed according to a mechanic, still stays in gear fine, just playing with the back passengers feet in 2nd and 4th. alot of play there.
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#6 Old 02-24-2013, 05:21 AM
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sprint97
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Originally Posted by inais View Post
i put gl-5 in mine recently. wasnt aware there was too much difference, walked in and got any old thing that said gear oil and was cheap.
my gear box is already stuffed according to a mechanic, still stays in gear fine, just playing with the back passengers feet in 2nd and 4th. alot of play there.
People...there is a lot of missinformation floating about oils for trans.
The vast majority of modern gearbox oils WILL NOT ruin or affect synch rings or any other part of the gearbox!
These days the correct oil is a GL5/6 75/90
I use this plus a box additive which has made for slick gearchanges...something the Hyundai is not famous for

Cheers,
Sprint97
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