I'm not sure, I suspect that OC600 is the correct term. I think it stands for Oil Compound but the numbers used in British army oil descriptions don't seem to directly relate to anything. Then there is OM13 which is hydraulic oil. The numbers do seem to get bigger with viscosity. OC600 doesn't so much pour as level out.
David
Last edited by David Herbert; 24-06-20 at 22:55.
Reason: Removed the reference to OM220 which I seem to have invented myself ! Sorry Mike C ! !
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