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spongebob
10-24-2020, 15:53
60k since I change it...green or orange fluid??
DmaxMaverick
10-24-2020, 16:53
Do you need to change it? Dexcool (OEM) is rated for 5 years or 150K miles, or forever. At any rate, don't use green. Use only Dexcool, or a quality brand labeled "meets or exceeds Dexcool", not just a coolant that isn't green. Premix or 50/50 with full strength and distilled water.
spongebob
10-24-2020, 17:20
It’s been 3 years and 61k miles....has orange in it now
More Power
10-28-2020, 13:54
It’s been 3 years and 61k miles....has orange in it now

Have a look at the following article about changing the Duramax water pump. There's a mention of the coolant and a couple photos that might interest you... ;)
https://www.thedieselpage.com/duramax/duramaxwaterpump.htm
spongebob
10-29-2020, 08:10
Thanks