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What Is a Differential Service on a Car? | Stop Gear Wear Before It Spreads

A differential service is draining old gear oil, checking for wear, then refilling with the exact fluid spec so the ring-and-pinion stay protected under load. Your car can feel fine while the differential is slowly chewing through its protection layer. No warning light. No obvious leak. Just heat, pressure, and metal-on-metal contact that ramps up

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