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Can anyone shed a little light on this subject for me? Whats the difference between a gl-4 and gl-5 synthetic gear oil? Which, if any, are bad for my car and why? I already have 3 qts. of mobil 1 which is a gl-5 gear oil...will this really damage my syncros or is it ok? or should I go with the Redline MT-90 which is a gl-4?
 

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gl-5 is corrosive to brass (syncros) i'd switch to GL-4.

GL-5 is a higher rating meaning it can withstand higher gear pressure, but because its corrosive its really only used in rear-ends and stuff where there are no brass parts.

MT-90 or MTL seem to be the two choices.
 

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Is mobil1 75W90 ok in the front differential of a '99 1.8T Tip?
 
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