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WHN · 10-12-2018, 07:11 AM

My simple answer is “no”.

True 600w oil is designed to be used on steam cylinders and is very thick.

90w oil is designed to be used in modern motorcycle transmissions and rear ends.

If you can’t find 600w oil, some Model A owners use STP in their transmissions and rear ends.

Lighter oil will cause leaking and shifting problems. Enjoy.

10-12-2018, 07:11 AM	#2
WHN Senior Member Join Date: Mar 2017 Location: Connecticut Shoreline Posts: 1,823	Re: 600w My simple answer is “no”. True 600w oil is designed to be used on steam cylinders and is very thick. 90w oil is designed to be used in modern motorcycle transmissions and rear ends. If you can’t find 600w oil, some Model A owners use STP in their transmissions and rear ends. Lighter oil will cause leaking and shifting problems. Enjoy.