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10-30 in the tranny??


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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:

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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.

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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.

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