lubrication question

[Tony Smith]

Originally Posted by Lynn Eades

According to the Canadian lube chart, grease everywhere......except for the gearbox coupling which took C600 gear oil !

Originally Posted by David Herbert

Lynn,
C600 is a British army specification for a very high viscosity and 'sticky' oil used in some gearboxes which have yellow metal components.

Is the British "C600" a post-war spec, or wartime?

If the Canadian chart specifies North American oils/greases (SAE), then there is a possibility that it could be referring to 600W gear oil, also a high viscosity and sticky oil that was in common use during the 20's and 30's as diff oil for the Model T and A Ford cars and trucks. Many other heavy US (and therefore, probably Canadian, trucks of the era used it for diff oil).

https://www.macsautoparts.com/ford_m...rt-bottle.html