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tony01 05-17-2013 10:54 AM

94 Wrangler AX 15 transmission oil change, which oil to use?
Hi All
I have a 94 wrangler 4l limited with an AX 15 transmission, now, I have to change the oil as it is beginning to refuse to change gear sometimes. My question is what type of oil can i use, the owners manual says GL5 75w-90
very expensive in the U.k. On looking on the forums many people say not to use GL5 oil, and some say the manufacturer now recomends 10w-30 synthetic engine oil, a lot cheaper. I need some clarification please help.
cold wet England.

c5wagner 05-17-2013 11:05 AM

I use Syncromesh
Synchromesh manual transmission fluid

But 10w-30 full synthetic is fine as well. It has to be synthetic though, and regular won't work. Though syncromesh is my favorite fluid so far.

kik 05-17-2013 12:14 PM

75W90 full syn gear oil or 10W30 full syn motor oil. Your choice.

YJ fanatic 05-17-2013 01:00 PM

79 Attachment(s)
I'm running full synthetic 10w30 and it's smooth as butter. Way better than it was, but I'm not sure what was in there before.

Dac7529 05-18-2013 03:59 AM

Definitely 10w30 75/90 is no longer recommended

Garyk 05-18-2013 12:07 PM

This has been beat to death on this forum, some use motoroil, some use full syn....what everybody agrees on is DO NOT use any fluids that are corrosive to yellow will eat the syncros.....

kik 05-18-2013 02:13 PM


Originally Posted by Dac7529 (Post 3767844)
Definitely 10w30 75/90 is no longer recommended

This isn't totally true. Back when the old GL5 rating and synchro eating fluid was on the market Chrysler recommended a change to 10W30 motor oil. Any of the "modern" 75W90 gear oils, full syn is better, or 10W30 motor oil, full syn is better, can be used.

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