Your rear differential is one of the most unappreciated parts in your car or truck. It does what might be the hardest job of all of those components, multiplying torque from your transmission and ...

While it’s likely seldom done, some vehicles’ maintenance schedules do include an interval for changing the differential fluid, though perhaps only under “severe service” conditions such as frequent ...

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A differential is one of a car's most important moving parts. It's the thing that takes the torque from the car's driveshaft, and distributes it among the driven wheels. Since there's a lot of ...

In a rear-wheel, or four-wheel drive vehicle, the differential oil change is probably one of the most overlooked routine maintenance items there is. Luckily, changing this thick, rich-smelling oil is ...

Q: I own a 2011 Toyota RAV4 V-6 all-wheel-drive with 59,000 miles. I have pulled a boat and trailer for approximately 2,500 miles since the car was new. At my last oil change the dealer recommended ...

Every time I get the oil changed on my 1998 Toyota Tacoma, the service man tries to sell me an oil change for the differentials. I decline because I don't want to pay the money and I'm not sure if the ...

Changing gear oil is one of those often-forgotten maintenance items on our rigs. Whether it's the smell of gear oil, the disposal of gear oil, or the mess that can sometimes come from popping a cover, ...

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? Changing the car differential oil—it's one of the most-overlooked maintenance tasks ...

Q: The owner's manual of my 2004 Honda Pilot recommends regular changing of the "VTM-4" rear differential fluid, which costs more than $100 each time. Is frequent replacement really necessary since I ...