I am dealing with a CVT that has an attached transfer case for an all wheel drive system. The transfer case oil mostly all disappeared, approximately 3/4 of a paper cup of oil was drained from the transfer case. There are no signs of external leakage. The suspected loss areas are, a seal that would allow it to pass into the CVT and pollute the CVT fluid, or a shady service center. So the question is what is the best way to find out if there is 80W-90 gear oil mixed with the CVT fluid? I have searched and found nothing on this topic, so forgive me for turning this into trouble shooting forum. I suppose I will try to install the out put shaft and just fill it and see what happens, the unit is off the CVT. Next question would be how detrimental to the clutch materials would the polluted fluid be?
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