[b] AX-15 / NP231 Lubricant[/b] - JeepForum.com
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Unread 03-29-2007, 09:12 AM   #1
lollygagger8
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[b] AX-15 / NP231 Lubricant[/b]

I'm changing fluids in my trans, and transfer case.

Ok, I know not to use GL-5 in my manual transmission cuz it has sulfer in it and will eat my brass synchro's. But, I've been doing a little research and read that Mobil-1 75W-90 is equivalent to Red Line MT-90.
Has anybody used the Mobil-1 75W-90 in their AX-15? (Mine is out of a 97 TJ) If not, what did you use??

Next, for my NP231: I heard ATF+3 was what should be in there. But then I heard ATF+4 is the new version. ATF+4 is Automatic Transmission Fluid. What should I use??

Help me obi wan kanobi's!!

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Unread 03-29-2007, 09:21 AM   #2
zman
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You can use the ATF 3 or 4.

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Unread 03-29-2007, 09:28 AM   #3
lollygagger8
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cool thanks....what about the Trans Fluid?
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Unread 03-29-2007, 09:29 AM   #4
RockWoRM
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I use a synth in my AX15... helped it shift quite a bit. IMHO, the brand does'nt matter as long as its 100% synthetic and the correct weight.



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Unread 03-29-2007, 09:54 AM   #5
Michael_94YJ
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any particular brand of automatic transmission fluid in the transfer case? and why ATF and not the same weight and oil as the transmission? Are they not interconnected? That confused me when i read it in Chiltons...
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Unread 03-29-2007, 10:55 AM   #6
lollygagger8
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Yes, I am confused as well.....I can't find anywhere that sells Redline (locally)
Am I going to be ok using the Mobil-1 75W-90??
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Unread 03-29-2007, 11:01 AM   #7
bisland-yj
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If you really want the Redline, Summit will get it to you in a couple of days. I order from them whenever i need something in a hurry.
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Unread 03-29-2007, 08:55 PM   #8
trickle26
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no... Mobil 1 75w-90 is a GL5 and not equivialent to the Redline mt90 or MTL.
It says it right on the Mobil 1 bottle that it is a GL5. I made the mistake and filled mine with Mobil 1 because i followed the manual and didn't know about gl5 messing up the synchros.
I ordered my Redline MTL from Summit Racing...Good deal and fast shipping. It helped my 1st -> 2nd shifting in cold temps a lot...

I go with Valvoline ATF+3 in my transfer case. Seems to work well.
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Unread 03-29-2007, 09:40 PM   #9
Weekender1969
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Quote:
Originally Posted by lollygagger8
I'm changing fluids in my trans, and transfer case.

Ok, I know not to use GL-5 in my manual transmission cuz it has sulfer in it and will eat my brass synchro's. But, I've been doing a little research and read that Mobil-1 75W-90 is equivalent to Red Line MT-90.
Has anybody used the Mobil-1 75W-90 in their AX-15? (Mine is out of a 97 TJ) If not, what did you use??

Next, for my NP231: I heard ATF+3 was what should be in there. But then I heard ATF+4 is the new version. ATF+4 is Automatic Transmission Fluid. What should I use??

Help me obi wan kanobi's!!
As I understand it, the AX15 is known for hard shifting, especially from 1st to second. I had to have mine rebuilt last year and the mechanic told me to run plain 90 weight in it until the shifting fork wore in then change to synthetic. I did this and it still had the hard shifting thing. Someone on here reccomended useing synchromesh. I compromised and bought the Amsoil sythetic synchromesh, it worked great. Took care of the hard shifting and the tranny has never ran smoother. I have heard of a lot of folks running it as well with similar praises. It is a bit on the thin side and that worried me at first but mine is doing fine. Synchromesh is a 5W30 oil but is made for manual trannys. It is supposed to help save the life of the synchros. So far I have no complaints about the synchromesh, but fair warning, it is not the reccomended oil from the manufacturer, but it works great for me.
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Unread 03-30-2007, 07:04 AM   #10
James04TJ
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The only two GL4s that are easy to come by in the CONUS are Redline MT-90 / MTL and AMSOIL MTG.
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Unread 03-30-2007, 07:20 AM   #11
lollygagger8
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Ok this is where I saw that Mobil-1 75w90 was equivelant to Redline MTL (you have to scroll almost to the bottom of the page)

http://www.4x4xplor.com/clutch.html

IF YOU DONT WANT TO LOOK IT UP, THIS IS WHAT IT SAYS
60. Don't refill the trans with the fluid recommended in the '97 owner's manual. DaimlerChrysler found out about a year after this was released that something in that compound caused pitting and premature failure in the synchros. An excerpt from another forum to back this up: "The 5 speed tranny uses brass synchros and the Owner's Manual says to use GL-5 gear lube. GL-5 has a sulfur base and will eat the brass." An alternative, Redline MT90 is recommended. We did a little research and learned that Mobil 1 75W-90 is equivalent to Redline MT-90, costs about the same and was the best stuff for the trans that was rated for this duty. Service manual calls for 3.3 liters. We used 4 because with the lube pump we used you can't drain the bottles completely anyway. It took 4 full bottles to get 3.3 in the trans. The remainder in each was consolidated into a single bottle and saved for next time we service our diffs.

When I called the Jeep Dealer yesterday, they said the AX-15 (remember, mine is out of a 97 wrangler) called for 75W90 GL-5 Lubricant Oil.
I did put the Mobil-1 75w90 in last night and drove it for about 50 miles so far. It's shifting just fine, but I will take it out and put Redline MTL-90 in if that's what everyone else is using!!
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Unread 03-30-2007, 09:23 AM   #12
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Since I'm freaking out about putting Mobil-1 in my AX-15, I have some Redline MT-90 coming on monday so I will put that in when I get off work. There goes another $50, lol
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Unread 03-30-2007, 12:06 PM   #13
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interesting info...I had never read that before, but I would be interested in the "little research" they did to see mobil 1 & Redline mt90 are equivalent. Did they try them both and look at the synchros to check for excessive wear??

I did the same thing as you-- Blew $50 on the mobil 1 and started checking around after driving 200 miles and changing to Redline.
All I know is Mobil 1 is GL5 and the strong sulfur smell stunk up the garage or maybe it was my stinky a**.
Redline MT90 or MTL is a GL4 and definitley didn't have the strong sulfur odor of the Mobil 1. BTW, my tranny is a 94' AX15


Someone on here mentioned the Factory Service manual has it correct. (i can't find the thread when I was going through this) It says to use GL4 but the owners manual is incorrect because it indicates GL5.
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Unread 04-03-2007, 07:27 AM   #14
lollygagger8
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I've since changed my fluid out, and driven about 150 on my AX-15 with Redline MT-90 Lube and I can say that it is outperforming the Mobil-1 by a long shot. It shifts better through all gears, and it barely ever grinds going into Reverse! I'm sold!!! (plus, trickle26 is right....it doesn't smell near as bad! lol)
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Unread 10-14-2009, 07:42 PM   #15
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Quote:
interesting info...I had never read that before, but I would be interested in the "little research" they did to see mobil 1 & Redline mt90 are equivalent. Did they try them both and look at the synchros to check for excessive wear??
Yeah, that makes no sense, the mobil-1 they reccomended as being the same as redline MT-90 is a high sulpha GL-5 gear oil with no syncromesh type friction modifiers. MTL and MT-90 are very low suphur GL-4's with heavy friction modifiers for incresed synchroniser function. They are pretty much practial polar opposites in terms of gear oils applications.
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