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Unread 03-13-2010, 10:01 AM   #1
JUnit91
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91' AX-15 Trans. Lube Substitutions?

Has anyone heard of using 15w40 motor oil instead of 75w90, or 80W90 gear oil for transmission lube?

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Unread 03-13-2010, 10:08 AM   #2
Mean Max
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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The Mopar gear oil part number used to be 4897622aa, but when you search that part number you'll see it has been superceded by part number 4761839AC which comes up as 10w-30 motor oil.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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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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Unread 03-13-2010, 10:27 AM   #3
JUnit91
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I assume 15W40 would work too, right?
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Unread 03-13-2010, 10:43 AM   #4
Mean Max
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I can't imagine that it would make that much difference.

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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Unread 03-13-2010, 10:54 AM   #5
JUnit91
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Thanks. I thought I read that somewhere. It was probably here!
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Unread 03-13-2010, 11:36 AM   #6
DaveinHouston
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I use 10W30 Mobil 1 in my AX15. It made a noticeable difference. The tranny shifts much smoother.
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Unread 03-13-2010, 04:57 PM   #7
JUnit91
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Does your tranny make any strange noises when it gets hot with the 10w30 in it? I'm going to request they put that in at my shop after the rebuild....I know they're going to look at me like I have ten heads!
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Unread 03-13-2010, 05:52 PM   #8
DaveinHouston
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No funny noises with mine but I don't think the fluid would either make or eliminate noises. From what I've read Jeep now recommends using 10W30 engine oil in the tranny but I can't swear to it. I've read it a couple of places. I changed my own out so no worries about telling someone what to put in it.
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Unread 03-14-2010, 09:05 AM   #9
JUnit91
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I just drained the 75w90 gear oil out of my trans., and filled it with Mobil 5000 10w30. I drove it around the block and it seems to shift well! I hope it lasts. I haven't had a chance to get it hot yet.
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Unread 04-01-2010, 06:34 PM   #10
JUnit91
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I too did some homework on the subject! I contacted my local dealer and they said 10w30 semi-synthetic is the new spec for the AX-15. I put 10w30 in mine, and it did shift nicely. I thought it shifted too nicely, almost "light duty-ish". I'm now using 20w30, and it works very well for me. It has more of a heavier duty cushion feel.
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