nsrmonkey wrote:judging by this I have just found in the workshop

"G.R.O. is an advanced synthetic formulation motor cycle gear-box oil covering the 10w/40 or 75w/90 viscosity range."

I should be getting 10/40

Just be careful quoting viscositys. 10w/40 is an engine oil, 75w/90 is a gear oil. They are measured on completly different scales.
A 10 weight gear oil is sh*t loads lighter than a 10 weight engine oil.

I know 99 percent of people are aware of this, but that leaves 1 percent that dont.
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