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Synthetic fluid??

  1. Blacksheep1
    Blacksheep1
    Have any of you changed over to syn? What kind? Results?
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  2. Goldie
    Goldie
    I planning on doing it when I have my next service for the truck (35,000 miles). The way I drive that will probably be the end of summer or fall some time. Since we are talking synthetics, does anyone know if 07 Sierra's (2wd) have synthetic gear oil in the differential?
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  3. Blacksheep1
    Blacksheep1
    I don't know Goldie... I'm wanting to switch mine all to syns soon...
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  4. Goldie
    Goldie
    I did some poking about and found out my 07 came from the factory with synthetic in the differential and regular gear oil in the trans. And that the fluid are not due to be changed until 100,000+ miles. So now my plan is to have the tranny only changed at 35,000 miles (next service) and change both at 100,000 miles.
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