Quote:
Originally Posted by Black Tire
Note that the manual specifies a 75W-90 gear oils with grade GL-3. From what I can find, GL-3 has been mostly superseded by the GL-4 specification. In any case, excellent synthetic GL-3 oil does not seem to be very available. My research also suggested that GL-5 gear oil would not be appropriate for this transmission.
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GL-3 seems to be specified when copper/bronze are used in the box and a GL-5 spec could cause corrosion as you no doubt found. GL-4 seems to be an alternative though, from memory?
It doesn't seem to be much of a penalty, to have a tight shift for a couple of minutes, to then have superb shift quality when the oil viscosity reaches its optimum in its normal operating temperature range.