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Re: Gearbox oil leak

I have owned a WM20 for 38 years and always used SAE50 in the engine and gearbox, as shown in the army hand book, 50HD. Another army designation for this oil was M220, which again was SAE50. What some people do not realise is that SAE viscosities for gear and engine oils run on different scales and 50 engine oil is actually about the same viscosity as 90 gear oil, but without any of the additives that might harm any bronze bushes. Also for maintaining the bikes it made sense to use one type of oil.

regards, Richard

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