Thanks for the posts Wayne.
I have been trying to do a little research into the gear oil question, and it would seem that if the GL5 has an MT1 designation, it may be OK for the yellow metals.
I also may start a program of changing the gear oils in most of the museum's vehicles, as well as my own. Pretty sure I have been using off the shelf 80W90 in most of my older transmissions, including my Jeep.
Perhaps we can post what oils are available at Cdn tire/NAPA/Walmart that are reasonably priced and fully compatible.
Barry mentioned using straight weight 50 motor oil in the transmissions. On one forum I looked at, they mentioned even going to as low as 30W oil and having satisfactory results.
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