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Many automotive differentials today are considered “fill for life,” meaning you allegedly don’t have to change gear lube. However, that typically means “fill for the life of the warranty.”
Plus, most automakers recommend changing gear lube if your driving conditions fall under the “severe” designation, which includes towing and hauling. It also includes submerging the differential in water (did you hear that, anglers?).
💥TIP: It’s a good idea to change gear lube even in “fill-for-life” differentials for long service life.
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