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Jeep Wrangler YJ
YJ General Discussion
AX-15 Transmission Fluid Report
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<blockquote data-quote="machoheadgames" data-source="post: 427372" data-attributes="member: 18789"><p>Yeah that's been around forever, however I don't follow it. The story is as follows: Aisin-Warner recommends 75W-90 GL3 for the transmission THEY created. Chrysler messes that up and fills them all at the factory with 75W-90 GL5 and prints that in the owner's manual as the fluid to use. Of course that causes problems due to the sulfur in the GL5 fluid. Knowing that, they later came out with the TSB and for some weird reason started telling everyone to use 10W-30. While this works half decently, it is still not the official recommendation by the manufacturer of the transmission. The official fluid to use is 75W-90 GL3, which in modern day has been superseded by GL4 which is basically the same as GL3 ever was which is now extinct. So, really and truly the proper choice is 75W-90 GL4. For that reason, I choose Redline MT-90. I have also tested motor oil and Redline is better. People will argue all day long that "the factory says to use 10W-30", but really that's just Chrysler, the same company to mess this all up to begin with when they filled them all up with the wrong fluid to begin with. It is indeed correct that 10W-30 and 75W-90GL4 are on similar viscosity settings, but GL4 has extra additives meant for gears, bearings, etc, that are not in motor oil. I don't think you'll ever kill the trans with motor oil but it certainly won't shift quite as well. Take that for what it's worth to you. Just thought I'd clear up what a lot of people don't seem to understand.</p><p></p><p>Long story short, I prefer the transmission manufacturer's recommendation over Chrysler's. What most people miss is that the GL5 was never what the manufacturer told anyone to use to begin with. They start not paying attention to details and mix up GL5 with the proper GL3/4 in their discussions.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 427372, member: 18789"] Yeah that's been around forever, however I don't follow it. The story is as follows: Aisin-Warner recommends 75W-90 GL3 for the transmission THEY created. Chrysler messes that up and fills them all at the factory with 75W-90 GL5 and prints that in the owner's manual as the fluid to use. Of course that causes problems due to the sulfur in the GL5 fluid. Knowing that, they later came out with the TSB and for some weird reason started telling everyone to use 10W-30. While this works half decently, it is still not the official recommendation by the manufacturer of the transmission. The official fluid to use is 75W-90 GL3, which in modern day has been superseded by GL4 which is basically the same as GL3 ever was which is now extinct. So, really and truly the proper choice is 75W-90 GL4. For that reason, I choose Redline MT-90. I have also tested motor oil and Redline is better. People will argue all day long that "the factory says to use 10W-30", but really that's just Chrysler, the same company to mess this all up to begin with when they filled them all up with the wrong fluid to begin with. It is indeed correct that 10W-30 and 75W-90GL4 are on similar viscosity settings, but GL4 has extra additives meant for gears, bearings, etc, that are not in motor oil. I don't think you'll ever kill the trans with motor oil but it certainly won't shift quite as well. Take that for what it's worth to you. Just thought I'd clear up what a lot of people don't seem to understand. Long story short, I prefer the transmission manufacturer's recommendation over Chrysler's. What most people miss is that the GL5 was never what the manufacturer told anyone to use to begin with. They start not paying attention to details and mix up GL5 with the proper GL3/4 in their discussions. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
AX-15 Transmission Fluid Report
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