As far as car fluids go, differential oil is one of the most neglected pieces of maintenance. It could be because the effects of not changing differential fluid on time aren’t as immediately obvious as other fluids like engine oil and coolant. Still, it doesn’t mean it’s unimportant. A car’s differential is essentially a group of gears that allow the inner and outer wheels of the drivetrain to spin at different speeds. If the wheels can only spin at
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