Forums
New posts
Search forums
Image search
Shop
Amazon Store
T-Shirts
Stickers
Members
Current visitors
Supporting Member Upgrade
Sponsors
About
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Image search
Search
Search titles only
By:
Search titles only
By:
Menu
Install the app
Install
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Jeep Wrangler YJ
YJ General Discussion
Manual trans lubes
Reply to thread
Message
<blockquote data-quote="machoheadgames" data-source="post: 430885" data-attributes="member: 18789"><p>The owner's manual is wrong, so no worried about being suggested to do that. The owner's manual incorrectly tells folks to run 75W90 GL5. That was from Chrysler, NOT Aisin Warner. Aisin Warner has always recommended 75W90 GL4, of course the difference between the two being the GL5 rating which contains sulphur for hypoid ring and pinion gears found in differentials. Chrysler realized their screw-up years later and recommended 10W30 motor oil. I'm guessing that is because 75W90 GL4 is not super common, especially not in the dealerships. They probably wanted to use something that they have a hose for. 10W30 is close in viscosity, although it is not the same and doesn't have the same additives. For that reason I prefer to run what the MANUFACTURER recommends and has recommended since day one, which is 75W90 GL4. They did manufacture the transmission after all, so I trust them. Chrysler only installed them into Jeeps, so their recommendation is really pretty worthless to me, especially after they screwed it all up from the beginning.</p><p></p><p>What 75W90 GL4 oil do I like? <a href="https://www.amazon.com/dp/B002INX20C/?tag=yjforum-20" target="_blank"><span style="font-size: 18px"><strong>Redline MT90</strong></span></a> - I buy the gallon jug from Amazon. It is a bit pricey, but it shifts really well. Not like you need to change it very often either.</p><p></p><p>Why don't you like Redline? It's been known to be one of the most favored fluids for AX5 & 15...I like it enough that if I trade my automatic truck in for the manual version, one of the first things I would do is dump the factory fill for a jug of MT85 from RL.</p><p></p><p>As for the transfer case, I have always run ATF and don't plan on changing. I'm sure 10W30 is also fine. I don't really know why one over the other was chosen by the manufacturers. I personally do not see any downsides to ATF, hence why I feel no need to switch. As in, I don't think that motor oil will provide any benefits that ATF isn't already providing. And it would be the same if it were the other way around, if they told me to use motor oil, I would, and wouldn't switch to ATF because I wouldn't perceive any benefits there either. For that one I just don't see a reason to change.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 430885, member: 18789"] The owner's manual is wrong, so no worried about being suggested to do that. The owner's manual incorrectly tells folks to run 75W90 GL5. That was from Chrysler, NOT Aisin Warner. Aisin Warner has always recommended 75W90 GL4, of course the difference between the two being the GL5 rating which contains sulphur for hypoid ring and pinion gears found in differentials. Chrysler realized their screw-up years later and recommended 10W30 motor oil. I'm guessing that is because 75W90 GL4 is not super common, especially not in the dealerships. They probably wanted to use something that they have a hose for. 10W30 is close in viscosity, although it is not the same and doesn't have the same additives. For that reason I prefer to run what the MANUFACTURER recommends and has recommended since day one, which is 75W90 GL4. They did manufacture the transmission after all, so I trust them. Chrysler only installed them into Jeeps, so their recommendation is really pretty worthless to me, especially after they screwed it all up from the beginning. What 75W90 GL4 oil do I like? [URL='https://www.amazon.com/dp/B002INX20C/?tag=yjforum-20'][SIZE=5][B]Redline MT90[/B][/SIZE][/URL] - I buy the gallon jug from Amazon. It is a bit pricey, but it shifts really well. Not like you need to change it very often either. Why don't you like Redline? It's been known to be one of the most favored fluids for AX5 & 15...I like it enough that if I trade my automatic truck in for the manual version, one of the first things I would do is dump the factory fill for a jug of MT85 from RL. As for the transfer case, I have always run ATF and don't plan on changing. I'm sure 10W30 is also fine. I don't really know why one over the other was chosen by the manufacturers. I personally do not see any downsides to ATF, hence why I feel no need to switch. As in, I don't think that motor oil will provide any benefits that ATF isn't already providing. And it would be the same if it were the other way around, if they told me to use motor oil, I would, and wouldn't switch to ATF because I wouldn't perceive any benefits there either. For that one I just don't see a reason to change. [/QUOTE]
Verification
Post reply
Forums
Jeep Wrangler YJ
YJ General Discussion
Manual trans lubes
Top
Bottom