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Why Your Differential and Transmission Deserve Better Than Generic Gear Lube Most drivers know exactly when their last oil change was. Ask when the differential fluid was last serviced, and you'll usually get a blank look. Gear lube is one of the most overlooked fluids in any vehicle, and the parts it protects are among the most expensive to replace. If the fluid in your differential and transmission is a generic "one-size-fits-all" product, it may be doing far less work than you think. What Gea …