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Gear oils are classified by the American Petroleum Institute using GL ratings. API viscosity ratings for gear oils are not directly comparable with those for motor oil, and they are thinner than the figures suggest
Opie Oils stocks a wide range of API (American petroleum institute) specification motorcycle gear oils. The most current and up to date specifications are listed below, however there are number of specifications that are commonly searched for but have become inactive GL-2 / GL-3 / GL-6 if you require any of these inactive specifications or you are in any doubt of what oil is correct for your bike please get a recommendation from our expert team