Searching Chevrolet‘s parts website only turned up one option direct from GM and that is the non-mixed Dex-Cool Coolant. My guess is that the part number you have is New Old Stock based on when I enter the part number you have, it does not come up on Chevrolet Parts. The below is the latest part number for Dex-Cool. I too would rather use a 1 gallon pre-mix as I wouldn’t need 2 gallons of coolant.

Chevrolet Parts Dex-Cool

 

I appreciate the clarification and help. Thank you!

 

Why is there a concern about using 50/50 premix? The only concern would be if the original concentration was inadequate, using 50/50 would only slightly increase the concentration. If you use 100% coolant, then you might make the mix too concentrated which reduces its cooling capacity.

I'd use Dex 50/50 of any brand and call it a day (and I'm kind of a nut about using factory/OE parts). If you do buy concentrate, make sure to mix only with distilled water. No tap.

 

Yep, I am probably over-focusing on something so obvious. I will follow your advice and use Dex 50/50; most likely I will stick with OE for now. Thank you so much!

 

I have a gallon of each in the garage, can take & post pics with part numbers if you would like?

 

That would be incredible! If it is not too much trouble, I would really appreciate it. That way I can put this topic to bed. Thank you!

 

“50/50 mixture of clean, drinkable water and use only DEX-COOL® coolant”

Idk if id throw tap water in but to each their own. Purified water is okay. Distilled water is cheap.

 

I prefer the Dexcool concentrate and do my own 50/50 mix with distilled water. When I do a coolant flush, I use only distilled water.

 

If you only need to top off the bottle a little just use water. If you have very hard tap water use distilled or RO.

 

If I add to the bottle, I add the little bit of straight concentrate.

 

One final question. The ACDelco Dex-Cool Extended Life Engine Coolant (Orange) - 1 gal ACDelco Part # 10-101, GM Part # 12346290 is OE for both gasoline and diesel engines?

 

My 2015 Chevy Sonic was also Dexcool. So yes to your question. Both gasoline powered and diesel powered vehicles from a certain year on. Now that I said that I am sure there will be an oddball GM vehicle listed somewhere otherwise. The only exception comes to mind is the electric vehicles. I have two gallon containers already self pre-mix.
Between my Chevy Cruze diesel and Colorado diesel operating in the hot south Florida weather small occasional top offs are needed.

 

I keep a gallon of the GM Dexcool concentrate on hand for topping off the resovoirs in my 16 Colorado and 02 Trans Am. Both use the Dexcool and I don’t believe in mixing fluids, especially the Dexcool.

 

Thanks 16WhiteColly! I am taking your advice. I just ordered the concentrate. All the best! Jim