bpm4x4 Posted July 19, 2006 Share Posted July 19, 2006 i just got off the phone with the dealer (trying to find out the correct oil for my 94-95ish AX-15) and they said GL3, but checked on something and said it is now supposed to take 10-30. So what should I put in this thing? :eek: Link to comment Share on other sites More sharing options...
DirtyComanche Posted July 19, 2006 Share Posted July 19, 2006 NOT THAT! 85-90 I think. Or 75-90. Or something. But NOT 10-30! Link to comment Share on other sites More sharing options...
87manche Posted July 19, 2006 Share Posted July 19, 2006 75-90W GL3 oil. not GL-5 that's rated as a three. Get the GL-3 from the dealer or Redline. GL-5 oil has a lot of sulphur in it, and it eats the syncros. Redline MT-90 is great, it's about $11 a quart though. Look for it at your local speed shop or order it from summit. Link to comment Share on other sites More sharing options...
bpm4x4 Posted July 20, 2006 Author Share Posted July 20, 2006 They tried to tell me that even though the two oils were different viscositys, they were very similar. I am going to get some GL 3, but not from the dealer. Link to comment Share on other sites More sharing options...
87manche Posted July 20, 2006 Share Posted July 20, 2006 whoever told you that 10-30 was similar to 75-90 had one thing right, they're both oil, and that's about it. 75-90w is much much thincker than 10-30. Think of 10-30 as water, and 75-90w as molasses. Link to comment Share on other sites More sharing options...
Eagle Posted July 20, 2006 Share Posted July 20, 2006 The real difference isn't the viscosity. You can't compare the numbers between gear oil and motor oil -- they aren't measured the same. The problem with using motor oil in a tranny that wasn't designed for it is that motor oil doesn't have any extreme pressure additives in it. Motor oil is intended for use in an environment where it is circulated by a pump, under pressure. Gear lube isn't under pressure, it gets distributed by splashing and dipping. So the only thing that prevents two sliding surfaces from just squeezing the lube out and self-destructing is the EP additives. They are all specially formulated. For example, when I saw that new Pennzoil Synchromesh fluid I bought a bunch of it to use in the Peugeot tranny in my '88 XJ. Then I read the label, and it didn't meet the Mopar spec for my tranny. I called Pennzoil and their engineer told me that stuff was formulated to run in the new NVG 3500 and NVG 4500 manual trannies, and should NOT be used in either the BA 10/5 or the AX5 and AX-15. I'd go with GL-3, or Redline. Link to comment Share on other sites More sharing options...
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