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|Thank you for providing the answer I was seeking. I got my '74 Mk 2 in 1986. Back then there was only the sub-par manual and a lot of calls to Delta. In the first few years I tried a lot of different oil weights in the 4 speed transmission. I ended up using Valvoline 20-50 racing oil because that's what I was using in the engine (it was more about constantly topping off the gearbox due to the unfix-able rear seal). Sounds like that was a good choice. Guess it's better to be lucky than good. I did change the differential oil back then. Know it was 90 wt. And know it must have had "hypoid" on the label. But never considered sulfur and yellow metals. Having now learned of them, it is reassuring to know it is not a consideration with regard to the differential. As I now find myself going back through the car doing things for the second and third times it is great there are so many more resources to tap (especially this message board).