Components That Require Lubricant
Transmission and Differentials
Both your transmission and differentials need fluid to lubricate the gears within them. Your transmission is one of the most important components in your heavy-duty vehicle and is arguably one of the most expensive to repair. Hence the need to keep its internal lubricant at peak functionality. Differentials also need their lubricants changed on a regular basis. Most manufacturers recommend transmission, and differential fluid is changed every 60 thousand miles.
Your diesel engine has a lot of inner components that need to be lubricated at all times. Without proper lubrication, your valves may bend, your camshaft lobes may flatten, and your head gasket may blow. Most manufacturers recommend you change your engine oil once every 3 to 6 thousand miles. This will ensure your moving parts are adequately lubricated at all times. Do keep in mind that when changing your engine oil, you must also change your oil filter and fuel filters as well.
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