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Unread 07-12-2013, 07:00 PM   #1
Mattias25
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ax5 gear oil!!!!

is this gear oil safe for my ax5? it's royal purple 75w-90 max gear


http://shop.advanceautoparts.com/web...rchTerm=75w-90

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Unread 07-12-2013, 07:09 PM   #2
UltimatE
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Cheap 10w30 from walmart, save your money for real mods.
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Unread 07-12-2013, 07:35 PM   #3
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Originally Posted by UltimatE View Post
Cheap 10w30 from walmart, save your money for real mods.
Yep
The only other thing I would use would be Pennzoil Synchromesh.
http://www.pennzoil.com/other-car-pr...mission-fluid/
What ever you do use make sure it is yellow metal compatibility.
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Unread 07-12-2013, 09:25 PM   #4
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x2 on the synchromesh.
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Unread 07-12-2013, 09:43 PM   #5
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Cheap 10w30 from walmart, save your money for real mods.
x2
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Unread 07-13-2013, 12:14 AM   #6
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10w30
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Unread 07-13-2013, 05:56 AM   #7
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I am running 80-90 GL-4 in my AX-15. I got it at NAPA.
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Unread 07-13-2013, 07:12 AM   #8
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Do some searching on here about Pennzoil Synchromesh, and AX-5's. Then ask yourself if you want to run anything else in it. I know I won't.
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Unread 07-13-2013, 07:19 AM   #9
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Quote:
Originally Posted by rodgers3

x2
x3 - cheapest Walmart 10w30
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Unread 07-13-2013, 09:09 AM   #10
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The spec for the ax5 is 75w-90 gear oil. Why is 10w30 motor oil being suggested?
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Unread 07-13-2013, 09:14 AM   #11
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The spec for the ax5 is 75w-90 gear oil. Why is 10w30 motor oil being suggested?
Because the factory put out a dealer service bulletin in like 1992 that changed the spec. Also from experience, these trannys don't like anything over 30 weight, I know cuz I tried it. Because they are built to such close tolerances and heavier oil needs a place to squeeze out into. Also because they aren't as rigid as an iron case 4-speed. The heavier oil actually increases gear and bearing wear because the tooth load on individual gear teeth goes way up and things start to overheat with the wrong oil.
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Unread 07-13-2013, 10:01 AM   #12
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Do some searching on here about Pennzoil Synchromesh, and AX-5's. Then ask yourself if you want to run anything else in it. I know I won't.
Actually, I haven't heard good things at all about Synchromesh. And given that the cheapest 10w30 provides absolutely perfect shifting from 80* down to -10*F in my transmission, I don't see why spending any extra money would be worth it.

http://www.jeepforum.com/forum/f12/1...trans-1100022/

Multiple people in that one thread report issues running it.
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Unread 07-13-2013, 10:08 AM   #13
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Originally Posted by UltimatE View Post
Actually, I haven't heard good things at all about Synchromesh. And given that the cheapest 10w30 provides absolutely perfect shifting from 80* down to -10*F in my transmission, I don't see why spending any extra money would be worth it.

http://www.jeepforum.com/forum/f12/1...trans-1100022/

Multiple people in that one thread report issues running it.
After pulling a valve cover off of a V8 that had been ran with Pennzoil all of it's life and finding, what could be best described as, a gelatin mold, I'll never run that crap in anything...to include my lawn mower.
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Unread 07-13-2013, 12:24 PM   #14
metalhead
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From talking to people at the jeep dealership I work at they say to use the 75w90 gear oil.
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Unread 07-13-2013, 12:33 PM   #15
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Originally Posted by metalhead View Post
The spec for the ax5 is 75w-90 gear oil. Why is 10w30 motor oil being suggested?
Conventional 10w-30 is the new spec for the AX-15. I use the cheap stuff from Wal-Mart.

Here's why I use 10W-30 motor oil in my AX-15.

The Mopar gear oil part number used to be 4897622aa, but when you search that part number you'll see it has been superceded by part number 4761839AC which comes up as 10w-30 motor oil. Here's a link to search the Mopar part numbers.

Discount Mopar Parts Jeep Dodge Chrysler parts & accessories with great service

It's the "new factory spec" lubricant.

Based on that, I use 10w-30 motor oil. I buy the Wal-Mart "Super Tech" store brand oil because it's cheap, meets all the API (American Petroleum Institute) grade qualifications and I change mine often, at least every 6 to 12 months.

Here's a link to the Jeep Engineers Q&A thread here on JF where I questioned the Jeep factory engineers on this very thing.

Here's my question post....
http://www.jeepforum.com/forum/f144/...ml#post8016389

And here's their reply.
http://www.jeepforum.com/forum/f144/...ml#post8016473

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