Forum Discussion

toban's avatar
toban
Explorer
Sep 19, 2015

How often do you change your differential oil?

I changed mine about 18,000 miles ago ( 4 years) to a semi synthetic 75-90 from a 85-140 because I live in colder climates.

What frequency do you change your oil? The truck garage I go to says the semis go a long time between changes as this oil doesn't break down the same as engine oil. I was thinking of going one more year or maybe that's overkill?

Toban
Class A
  • BobGed's avatar
    BobGed
    Explorer
    Sep 19, 2015
    According to Freightliner the synthetic gear lube SHOULD be changed every three years. I don't know what the other manufacturer's requirements are.
  • billsenick's avatar
    billsenick
    Explorer
    Sep 19, 2015
    When I bought my 2003 Kountry Star I immediately changed all fluids to full synthetic, engine oil every 5K real differential at 2K now have 118,775 on coach and have never changed out the rear again. Of all vehicles that I have owned I never change out rear fluid except to synthetic to replace dino gear oil, I am 70 years old and have never had a differential service problem NEVER. Do as you will, that's my story.

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