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F80 Gear box oil

Posted: Wed Feb 08, 2012 2:13 pm
by WIDE BOY
Does anyone have any recomendations for a gear box oil to suit rocky gear box, the owners manual recomends a GL4 80W90.
I am finding it difficult to find a GL4 in that viscosity, most brands seem to be a GL5. Are the synthetic oils worth the extra expense?

regards Wide Boy