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KCK infographic explaining GL-4, GL-5 and GL-6 gear oil specifications, viscosity, EP chemistry, Limited Slip compatibility and gear oil selection.
4WD Gear Oil

GL-4, GL-5, GL-6 & Gear Oil Specifications Explained

Confused by GL-4, GL-5, GL-6, 85W-140 and all the other numbers on a gear-oil bottle? You're not alone. Learn what these specifications actually mean, why viscosity isn't the whole story, how addit...