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Unread 09-09-2010, 01:05 PM   #1
Destr0
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10w30 in AX5/AX15 trans-

Been doing it since 1998 when I brought my TJ (with about 5K miles on it at the time) into the dealership because on cold Chicago mornings the shifter would not like to move.

The dealership mechanics put in a new trans fluid for winter and all was good- it was a bit stiff until warm but not hard to move like previous. I asked what was used so I could change it out when the time came.

10w30 synthetic oil was what they used. They said you can use gear lube in summer but for winter they recommended a lighter gear oil or 10w30.

Been running 10w30 in winter (and most of the time) and 10w40 in summer, when I change it and know I will drive enough to change again before winter.

Never had a problem, and I put 100k + miles of trouble free Chicago stop and go on that trans without a single mishap.

Now I hear horror stories of people who say I am crazy if I put 10w30 in my AX5 on my '94 YJ and the AX15 I will be swapping in soon.

Anyone care to share if they have used motor oil in a trans?

Thanks!

BTW- Chrysler still recommends 10w30 as the fluid for the AX series of trans... Go figure.

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Unread 09-09-2010, 01:09 PM   #2
Joe Dillard
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It has been 11+ years since I first started using motor oil in my AX-15 & all is well.
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Unread 09-09-2010, 01:13 PM   #3
Leans93
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I've used 10w30 in both my AX5 and AX15. 7 years with no issues
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Unread 09-09-2010, 02:50 PM   #4
mdubs
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WTF?!

Seriously!?

This is the first time that I have ever heard of this. That's 3 so far that have said they use motor oil in their tranny. Now I'm interested. Keep 'em coming guys.

Some horror stories would be appreciated as well.

Shall I throw some gas on the fire and inquire as to whether or not you should add the lucas oil stabilizer if you use the 10w30 in the tranny?
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Unread 09-09-2010, 03:04 PM   #5
Destr0
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mdubs- Check out your local Jeep dealership parts counter and ask for "gear lube" for your AX5/AX15. You will get part number Part Number 4761839AC. Lookup this part number and it is 10w30 motor oil.
Take your Jeep into service on the trans and that is what they will fill it back up with.

This is nothing new, Ford and BMW have been using ATF (a lot thinner than oil) in thier manual transmissions for years. Mercedes has used motor oil and ATF...

Remember this is for the AX5/AX15 only- they are simple mechanical gearboxes with an oil bath lubrication- nothing too fancy.
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Unread 09-09-2010, 03:04 PM   #6
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I use ATF in mine, it works fine and that is what my mustang came with from the factory 15 years ago.

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Unread 09-09-2010, 03:07 PM   #7
Destr0
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also remember the transfer case is filled with ATF and it is pretty much a transmission in its own right- just with only a couple gear options. :-)
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Unread 09-09-2010, 03:41 PM   #8
UltimatE
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10w30 is what the Jeep Engineers changed to many years ago. I've been running 10w30 in the ax-15 for a while now, shifts perfectly.
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Unread 09-09-2010, 04:08 PM   #9
mdubs
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Quote:
Originally Posted by Destr0 View Post
mdubs- Check out your local Jeep dealership parts counter and ask for "gear lube" for your AX5/AX15. You will get part number Part Number 4761839AC. Lookup this part number and it is 10w30 motor oil.
Take your Jeep into service on the trans and that is what they will fill it back up with.

This is nothing new, Ford and BMW have been using ATF (a lot thinner than oil) in thier manual transmissions for years. Mercedes has used motor oil and ATF...

Remember this is for the AX5/AX15 only- they are simple mechanical gearboxes with an oil bath lubrication- nothing too fancy.
Hmmm... I read somewheres that the pennzoil syncromesh was the shizzle for the AX15. I threw that in after purchasing my jeep and it actually seems to shift a little bit rougher than it used to. That crap was pricey too.

Maybe I shall perform a drain and lube in the near future.

Thanks for the info Destr0
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Unread 09-09-2010, 04:32 PM   #10
Darold
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Peugeot,say's to use 20/50 motor oil in the BA10-5 speed that was used in the 88 YJ . Have been using it for some time now and performs better than anything else that I have tried.
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Unread 09-09-2010, 06:17 PM   #11
DOHCRT
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Motor oil works ok, but a "synchromesh" type fluid works the best. Redline MTL or MT90, Amsoil MTF, Royal Purple MTL, and Penzoil Synchromesh are all great. The Royal Purple stuff tends to be a little "thinner" than the rest. I have found these fluids to provide better shifts than motor oil, but that's just my experience.

I am currently using Redline MT90 in my AX15, and its fantastic. I use it year round and the trans shifts like butter at all temperatures. If you live in a colder climate, MTL may be a better choice.

If you want to use motor oil, consider using Mobil 1 high mileage 10w30.
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Unread 09-09-2010, 06:37 PM   #12
ChevyBlazerBoy
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I use Redline MT90 good stuff. I don't drive my jeep in the winter.
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Unread 09-09-2010, 09:03 PM   #13
mylightsrsquare
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wow i have never heard of this before, i may try the 20/50 in my Peugeot when i get around to changing the fluid
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Unread 09-09-2010, 09:08 PM   #14
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Quote:
Originally Posted by Darold View Post
Peugeot,say's to use 20/50 motor oil in the BA10-5 speed that was used in the 88 YJ . Have been using it for some time now and performs better than anything else that I have tried.
this may be a stupid question but its better than a stupid mistake, do you mean 20w50 oil or is that a ratio for motor oil/tranny fluid?
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Unread 09-09-2010, 09:09 PM   #15
BriansCJ
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10w-30 is the new mopar spec for the AX-15.
Thats what I run.
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