Performing the task of changing the differential oil in a car is often overlooked. Unlike the engine, the differential does not receive the same attention. However, even with all its power, the engine will not get you from A to B without your differential. So, let's take a minute to learn a little more about your differential and the maintenance it needs.
The differential enables a car to navigate corners smoothly by allowing the drive wheels to rotate at different speeds. Without this function, both wheels would rotate together, causing instability due to the outside tire traveling a greater distance than the inside.
Changing the differential oil is as crucial as changing the engine oil, as it prevents metal-to-metal contact, which leads to surface wear and heat generation from friction. This friction weakens the gears and can result in failure over time.
One size does not fit all, motor oils and differential oils perform a similar task, but they are quite different in construction. Typically, you will need an oil heavier than eighty weight in your differential. In addition, certain differentials require friction modifiers. Finally, we see this most often with Jeeps, modified differentials could be completely different than the factory set up which means your vehicle may not use the factory specified oils. For these reasons, it is vitally important to visit a repair facility that specializes in differential services to ensure the proper weight and additives are used for your vehicle's differential system.
A differential fluid service is a straightforward service. It entails removing the differential cover, draining the old fluid, and cleaning the housing. This is an excellent time for your technician to inspect the components of your differential. This gives them the opportunity to spot any potential issues before they become a big problem. If everything looks good, the cover is replaced and resealed and fresh fluid and additives (if required) will be replaced in the unit. Unlike an engine oil change, differential oil only needs to be changed every 30,000 to 50,000 miles (check your vehicle's service intervals).
So, how do you know if your differential is failing? You will hear a grinding, clunking, or howling. You may notice it more while accelerating, decelerating, or navigating turns. These are early signs and if you have not had a fluid service- you should get an inspection done ASAP before further damage can be done.
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