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Royal Purple Gear Oil

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On many of the Mag-Hytech applications, the fluid capacity is nearly doubled, which helps tremendously with heat reduction. Most late-model trucks call for a synthetic fluid as it’s formulated to last longer and stay cooler. We’ve had great luck with 75W-90 fully synthetic from Royal Purple and like that the Max Gear formula comes with a friction-modifier additive mixed-in. Depending on your specific differential type, it’s best to double check your manual to see if your rig calls for an additional fluid additive.