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Old 03-31-2012, 07:45 AM   #1
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Valvoline synpower 75-90

Did I just waste 44$ in my 99 ax15
Guy said yes it'll work cause book said gl5
. I changed when I got home , now I see it's suppose to be gl4 .

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Old 03-31-2012, 09:09 AM   #2
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/shameless bump

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Old 03-31-2012, 11:05 AM   #3
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Quote:
Originally Posted by VoodooShot View Post
Did I just waste 44$ in my 99 ax15
Guy said yes it'll work cause book said gl5
. I changed when I got home , now I see it's suppose to be gl4 .
Sort of ...

You need to get that out of your tranny ASAP ... the GL-5 wears or eats brass synchros (from what I've read). You definitely need GL-4.

The problem your going to have is finding GL-4. Redline MT-90 is a good one. Go to their website and find local dealers in your area (if there are any).

I've also read (but do not take my word for it) that you can use 10W30 in the tranny. I am changing mine soon and will do more research myself.

Now about the valvo ... drain it into something you can keep it in and use it in your differentials whenever you need to change the diff oil ...

Its kind of funny you post this cause I did the same thing in my toyota truck. I put in the same Valvoline and it turned out it was to "slippery" for my synchros. It shifted badly ... Then I changed the oil to Redline MT-90 now it shifts perfectly. I also kept my Valvo oil for my 99 Jeep differentials ....

Hope this helps ...
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Old 03-31-2012, 11:44 AM   #4
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Quote:
Originally Posted by VoodooShot View Post
Did I just waste 44$ in my 99 ax15
Guy said yes it'll work cause book said gl5
. I changed when I got home , now I see it's suppose to be gl4 .
Older books were incorrect when they said to use GL-5, it needs to be either GL-3 (hard to find) or GL-4. GL-5 is not recommended because most (but not all) GL-5 gear lubes have sulphur-based additives which are harsh on yellow metals which includes the transmission's brass gear synchronizers.

So yes, get that stuff out because Valvoline Synpower is sulphur-based but it won't do immediate short-term damage so no worries.

Yes you can use a synthetic 10W-30 motor oil, the manufacturer of the AX-15 added that to the list of approved gear lubes several years ago. No worries, 10W-30 motor oil has essentially the same viscosity of 75W-90 gear lube because motor oil and gear oil are measured on two different viscosity scales.

Or use Redline MT-90 which is a synthetic GL-4 75W-90.

There are a few GL-5 75W-90 gear lubes that don't use sulphur-based additives and are thus safe for transmissions but it's easier to just use Redline MT-90 or, easier yet, just a good brand of synthetic 10W-30 motor oil. Yes that really is approved for use for the AX-5 and AX-15 transmissions and it works well in them.

If you do ever pick up a bottle of synthetic 75W-90 GL-5 gear lube and it says safe for yellow metals (brass synchronizers), it's fine for use in the AX-15 and AX-5.
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Old 03-31-2012, 04:20 PM   #5
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Tu guys
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Old 04-01-2012, 05:34 PM   #6
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ha i just ordered some red line mt90 today! bought my jeep about a year ago and she seems like she shifts a little funky. no clue what is in there. after i am done with her at least i'll know. this forum is great for stuff like this.some really smart people on here.
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Old 04-01-2012, 05:40 PM   #7
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What year TJ do you have Leeroy?
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Old 04-01-2012, 05:41 PM   #8
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1997 4.0 hope i didn't screw up.lol
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Old 04-01-2012, 06:04 PM   #9
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1997 4.0 hope i didn't screw up.lol
Ya done well and made the right choice for your '97, it is only on 2000 and newer when Redline MT-90 isn't the right stuff.
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Old 04-01-2012, 06:23 PM   #10
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thanks Jerry. while i have your ear(sorry to change the subject) i have a question about the my a/c system. i do HVAC for a living and my compressor took a crap on me last year. i am in the process of swapping it out.i bought a new accumulator and orifice. i am skeptical about using what is considered a flush. we try to never use anything but oil and refrigerant in an hvac system.is this stuff safe?(i'm assuming so). also i understand that i am supposed to drain the oil from the new compressor,measure it and add the rest(total of 8 ounces) to the accumulator. is this correct? i am gonna nitrogen and pull a vacuum on it. once again sorry to change the subject. my main concern is about the flush and oil. thanks
Jack

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