CAN I USE AUTO LAB PREMIXED ANTIFREEZE COLLANT IN A 1993 SIERRA?

Asked by Jan 22, 2017 at 11:12 PM about the 1993 GMC Sierra 1500 C1500 SLX Extended Cab LB

Question type: Maintenance & Repair

I AM IN NEED OF TOPPING UP COLLANT AND
AM FINACIALLY STRAPPED HAVE THE OPTION
OF MY FRIEND GIVING ME SEALED BOTTLE OF      
SOME NEW AUTO LAB PREMIXED ANTIFREEZE
COLLANT, IS THIS ALRIGHT ?

2 Answers

145

If you have Dexcool in it, you don't want to mix it with standard fluid unless it's labeled universal (and even then, best to stick with ONE type). You can tell if it's orange or orange-red it's got nitrates, which is DexCool. You can remove ALL the coolant and switch to another type, but dex cool is supposed to lead to longer pump life- but studies have shown that a well maintained system with standard ethylene glycol (green) stuff works just fine.

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Thankyou very much.

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