RedLine MT-90 oil for manual transmission?

Dec 24, 2005 4 Replies
R

Ok ... I just found out some bad news, and I wanted some good advice.



I've got a '91 XJ, with an AX-15 manual tranny. It has brass synchro rings. The owner's manual calls for GL-5 gear oil.



I just read that was a mistake ... they ran that info for about 2 years, then changed it to GL-3 oil.



Turns out, the sulfur and sulfite additives in the GL-5 grade oil eat up the brass synchros.



Anybody else heard that?



What about redline MT-90? is that good? Will it do any damage? Thanks in advance ... any info would be appreciated ... even if it's not directly related ... :-)


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R

Hi Bill:

Pennzoil synchromesh is not a GL-5, nor is the Daimler/chrysler oil. GL-5 is great for differentials, as you said, because they have no soft yellow metals. GL-3 fluids are better for manual trannies with brass synchros, because it has so much less sulfur & sulfite additives in it.

Call your dealership service desk, they will verify it. Normal GL-5 dino oil is quite harmful to the AX 5/15 trannies.

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A light duty lube such as GL-3 would be a good choice for a mall poser,> as you.

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B

Mercedes Benz is the best engineering company in the automotive business, but their recommendation is for their transmission, which might not have the same type of synchros.

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