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Old 05-10-2011, 02:28 PM   #1
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AX15 Advice, Opinions, Help

I bought my 99 TJ a couple of months ago. I am in the process of changing all the fluids, as I don't know what's in her nor how bad she's been treated.

So this past weekend I changed the fluid in the AX15. Redline MT-90 is not carried in any of my local stores. I know GL5 is a no no, and 10w-30/40 seems to be what is now recommended. I wanted to put in something a little better in her, so I put in Royal Purple 15w-40 Synthectic motor oil.

Before - It was a little stiff and did not like to come out of gear to down shift, until the wheel speed and gear speed where fairly close.

After - Now it is slow to synch in any gear, I have to put a little preasure on the gear I want, then ease off then put preasure back on and it will
usually go on into gear. Of course when wheel speed and gear speed are close, the problems are minimul. It does not grind unless I try to force it in gear before it is ready. Sometimes this means just holding the clutch in for a few extr seconds while it declerates.

It sorta feels like it's too thick and slow to synch. Iv'e got about 50 miles on the new fluid.

Should I try 10w-30?

I hate to waste the money I spent on the RP.
Should I give it longer to settle in?

I can get NAPA GL4 locally, but I'm not sure that would be any better than what I have.

I can order the RedLine MT-90, but I hate to waste the RP and end up with the same results.

The RP 15w-40 is close to the same viscosity as the MT-90 from what I have read. So I don't see why would be causing any issues.


Advice welcomed!!!

Thanks in advance.

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Old 05-10-2011, 02:31 PM   #2
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The spec for the trans is 10/30 as you know, 15/40 may be too thick. Not sure on the comparison to the mt90 though. It would be rough to shift when it gets cold for sure though!

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Old 05-10-2011, 02:33 PM   #3
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Shoulda went with 10w-30 synthetic. Did mine awhile ago and no problems at all. I have a 97 with the ax-15, can't beat it with a stick. Think I used quaker state. Or valvoline maybe.
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Old 05-10-2011, 02:40 PM   #4
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I would cut your losses and change it. I went with Redline MTL and it shifts beautifully. As others have said, synthetic 10/30 seems to work just as well and will definitely be cheaper than Redline.
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Old 05-10-2011, 02:41 PM   #5
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Why did you choose a synthetic 15W-40 when the recommendations you read said synthetic 10W-30?? 15W-40 has too high of a viscosity (too thick), no wonder it's not shifting properly. Dump that RP 15x-40 and just refill it with any good quality synthetic 10W-30. Or order the Redline MT-90 which is superb inside the AX-15. Royal Purple is no better than Valvoline, Pennzoil, Havoline, etc.. It just costs more for the purple dye they add to it for marketing purposes. You know, royal = purple and all that... its purple color is from nothing but dye that goes away after a while.
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Old 05-10-2011, 04:23 PM   #6
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[QUOTE=Jerry Bransford;1231066]Why did you choose a synthetic 15W-40 when the recommendations you read said synthetic 10W-30??/QUOTE]

Yeah, I'm asking my self the same question. I got caught if in the RP is better propaganda. Auto Zone did not have the 10w-30 in the gallon jug, which is what I wanted. So I thought 40 is close on the viscosity chart to GL90 which is what MT-90 is. So I ventured off course.

I broke my own rule. "If you don't really know, don't do it"

Well Thanks for all the replies. They helped confirm what I already knew.

$30 somthing bucks down the drain
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Old 05-10-2011, 04:39 PM   #7
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I just used Mobil 1 synthetic 10/30 and it shifts perfect. Dump that fluid before you do any damage to the synchro's or something.
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Old 05-10-2011, 05:18 PM   #8
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Quote:
Originally Posted by Ken1024 View Post
Auto Zone did not have the 10w-30 in the gallon jug, which is what I wanted. So I thought 40 is close on the viscosity chart to GL90 which is what MT-90 is. :
Gear lube, like 75W-90, is measured on a different viscosity scale than motor oil is. So 10W-30 motor oil is actually essentially the same viscosity as 75W-90 gear lube is. That is why Aisin, the manufacturer of the AX-5 and AX-15, has said a synthetic 10W-30 is a good alternative to GL-3 or GL-4 75W-90 gear lube like Redline's MT-90 is.
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Old 05-11-2011, 08:52 PM   #9
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I flushed out the Royal Purple and put in 10W-30 synthetic.

I'm calling it my Royal Flush!
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Old 05-11-2011, 09:37 PM   #10
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Listen to Jerry. I learned what he is telling you by putting GL5 75 90 in mine.... Doop!
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Old 06-19-2011, 05:25 PM   #11
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How many quarts in the AX-15?
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Old 06-19-2011, 05:41 PM   #12
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Quote:
Originally Posted by juan_p__m
How many quarts in the AX-15?
3.something. Buy 4 and fill it till it comes out the fill hole.

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