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Old 04-30-2013, 07:16 PM   #1
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What oil for AX15?

Changing the fluid in mine and just wondering what everyone else is using. I've read Redline MT90 is best, but no stores around here carry it. What about Valvoline Synpower 75w90?

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Old 04-30-2013, 07:48 PM   #2
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Yup that will work. That's what I got in mine. But mines amsoil

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Old 04-30-2013, 07:56 PM   #3
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I just used some synthetic 10w30 shifts so much better with good ol motor oil
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Old 04-30-2013, 07:59 PM   #4
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Well, I've been researching this all night, and everywhere says to not use a GL-5 oil in it because it will eat the synchros. And the Valvoline is a GL-5, but some say its fine. I think I might just run a synthetic 10w30, since Jeep started to recommend it.
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Old 04-30-2013, 08:04 PM   #5
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Since when did they make gear oil for transmissions that eats the metal in the synchros. I got go look this one up. I have seen it here before but still don't believe it. However I do know about the 10W-30 synthetic motor oil. It has about the same viscosity as the gear oil and now recommended by Chrysler in manual transmissions.

So here is what I found and some interesting input from users. The GL-4 performs better than GL-5 in trannys and the GL-5 is great for the diff. But it is compatible in both and doesn't eat synchros.

GEAR 300
75W-90
Racing gearbox and differential lubricant

100% Synthetic – Ester based

TYPE OF USE
Specially designed for racing vehicle gearboxes : speed way, rallye, raid…
All mechanical transmission, synchronised or not synchronised gearboxes, gearbox/differential, transfer
gearboxes and hypod differentials without limited slip system operating under shocks, heavy loads and
low revolution speed or moderate loads and high revolution speed.

PERFORMANCES
STANDARDS API GL4 and GL5 / MIL-L-2105D
100% synthetic extreme pressure lubricant for an efficient anti wear protection, a better resistance at
high temperature and a longer life time.
0% shear loss : Unshearable oil film in extreme conditions.
Stays in 90 grade after KRL 20 hours shear test as requested by SAE J306 Standard, July 1998 update
Very high lubricating power which decreases friction and wear.
90 grade at hot temperature to provide outstanding oil film resistance at hot temperature and/or to
reduce transmission noise.
Fluid at low temperature to allow easier gear shifting when the gearbox is cold.
Less effort required on the gear lever to shift the gears.
Suitable for any type of seal and yellow material used in gearboxes design.
Anti-corrosion, Anti-foam.

RECOMMENDATIONS
Oil change: According to manufacturers' requirements and adjust according to your own use.

PROPERTIES
Viscosity grade SAE J306 75W-90
Density at 15C (59F) ASTM D1298 0.900
Viscosity at 40C (104F) ASTM D445 72.6 mm/s
Viscosity at 100C (212F) ASTM D445 15.2 mm/s
Viscosity index VIE ASTM D2270 222
Flash point ASTM D92 200C / 392F
Pour point ASTM D97 -60C / -76F

My .02 and that is it. Gear oils and brands are a personal choice so I hope you have enough info to make your decision and make your Jeep shift better. I am off the soapbox now.
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Old 04-30-2013, 08:18 PM   #6
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GL-5 oils contain a sulfurous compound which is corrosive to yellow metals. So it would eat and pit the brass synchros. I haven't seen results of it in person, but a couple friends saw what happened to an AX15 when they rebuilt it after running Lucas GL-5 oil in it exclusively. Apparently it was not pretty.

The GL-5 might not be a problem, but I've read so many things that say to not use it, so I don't really want to take a chance. I think I'll just go with 10w30.
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Old 04-30-2013, 08:30 PM   #7
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10-30 motor oil.
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Old 05-01-2013, 06:16 PM   #8
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75W90 full syn gear oil or full syn 10W30 motor oil. Either one. I use full syn 75W90 gear oil.
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Old 05-01-2013, 07:35 PM   #9
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I filled it up with full synthetic 10w30 today. Couldn't find any 75w90 gear oil that wasn't gl-5. Smooth as butter now.
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Old 05-01-2013, 11:13 PM   #10
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Great news!!!
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Old 05-01-2013, 11:22 PM   #11
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Oh yeah, definitely better than what was in there. It had like a 50/50 mix of water and some kind of oil. No clue what it was, but it was nasty.
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Old 05-01-2013, 11:40 PM   #12
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I've got my AX15 in a TJ but... anyway, redline MTL made my trans shift smoother that whatever was in it and a lot of others are happy with it too. I had to go to a local parts chain here to find it. Check redline's page to find a supplier or there's always mail order.
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Old 05-02-2013, 08:20 AM   #13
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I might try the Redline later, but I had to have my jeep now. None of the local parts stores had it, so I just went with the 10w30 for now.
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Old 05-02-2013, 06:07 PM   #14
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Originally Posted by jokerchief462 View Post
Since when did they make gear oil for transmissions that eats the metal in the synchros. I got go look this one up.
Don't bother I have personal experience with this. I put the 5 in, bad move ate the zinc out of my synchros.
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Old 05-02-2013, 07:01 PM   #15
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Don't bother I have personal experience with this. I put the 5 in, bad move ate the zinc out of my synchros.

Definitely makes me glad I didn't put that in it. I had bought some to begin with, but researched it before I filled it.
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Old 09-16-2013, 05:06 PM   #16
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Wow, in the Jeep manual, it specifically states Mopar 75w-90 gear oil GL5, almost put that in, but wanted to check here 1st. glad I checked and didn't put in GL-5! Going to go with Syn 10w-30 instead.
Thx guys
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Old 09-16-2013, 05:28 PM   #17
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The issue with the GL5 gear oil was approx. 20 yrs. ago. Chrysler then issued new info. to use 10W30 motor oil instead. Again, that was approx. 20 years ago. Today, all of the "new" oils will not eat the synchros. Conventional or full syn 75W90 gear oil is fine to use. I use full syn. Or, 10w30 motor oil. full syn 10w30 would be better than conventional. Your choice.
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Old 09-16-2013, 06:44 PM   #18
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The issue with the GL5 gear oil was approx. 20 yrs. ago. Chrysler then issued new info. to use 10W30 motor oil instead. Again, that was approx. 20 years ago. Today, all of the "new" oils will not eat the synchros. Conventional or full syn 75W90 gear oil is fine to use. I use full syn. Or, 10w30 motor oil. full syn 10w30 would be better than conventional. Your choice.
Don't be so quick to say that, I put in 75w90 GL-5 Royal Purple in my AX-15 in 2011 and it destroyed my synchros. I replaced them and put MT-90 GL-4 in and had no issues.

This website has lots of good info on GL-4 versus GL-5
http://www.bobistheoilguy.com/
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Old 09-17-2013, 11:45 AM   #19
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Don't be so quick to say that, I put in 75w90 GL-5 Royal Purple in my AX-15 in 2011 and it destroyed my synchros. I replaced them and put MT-90 GL-4 in and had no issues.

This website has lots of good info on GL-4 versus GL-5
- Bob is the Oil Guy
If full synthetic 75W90 gear oil is used there won't be a problem because it doesn't have the specific additives in it that could be corrosive to "yellow" metals. I wouldn't use non synthetic GL-5 gear oil in an AX15.
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Old 09-17-2013, 12:02 PM   #20
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But royal purple 75w90 is all synthetic
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Old 09-17-2013, 02:26 PM   #21
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But royal purple 75w90 is all synthetic
It shouldn't have damaged the synchros, but obviously I don't doubt your experience with it. All of the research indicates full syn shouldn't do it, but they also indicate that it's not 100% for every brand out there. Based on your experience I wouldn't use GL5 Royal Purple. I have been using full syn Valvoline in my AX15 and also in my diffs for years with no negative effect on the synchros. It has shifted better since I began to use it.
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Old 09-17-2013, 02:32 PM   #22
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fair nuff
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Old 09-17-2013, 02:38 PM   #23
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fair nuff
I thought you might find this interesting regarding what Royal Purple claims: Again, I don't doubt your experience with it.

Max Gear is an ultra-tough, high performance synthetic gear oil designed to provide maximum protection to heavily loaded gears. Max Gear excels in axles containing open, limited-slip, locker, and spool equipped differentials. Max Gear is also recommended for use in truck and automotive front or rear differentials, manual transmissions and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid. Max Gear is non-corrosive to soft yellow metals (brass, bronze, copper) and is safe for use in manual transmissions with Synchronizers.
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Old 09-17-2013, 03:00 PM   #24
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man I should sue them
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Old 09-17-2013, 05:41 PM   #25
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How much of the oil should you put in?

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