[72SB]

LNP

I understand your concern about Dexcool. Yes GM had issue with it as I mentioned. My 96 came with it and in short order brown sludge (within a year IIRC). The car was under new car warranty and the dealership flushed the system and replaced with green which to this day I still use in that car although it is now a 383

My understanding was GM started all models in 96 with a 100k mi full service Maintenace schedule so needed a coolant that would last that long. Unfortunately, the Dexcool was not up to that task and also the anti-leak pellets GM put in cooling systems then really did react chemically to Dexcool which turned it into brown sludge. I don't know when Dexcool was reformulated, but it was

My neighbor was a mechanic for state road Maintenace (CalTrans) and he said they took Dexcool out of all their trucks as they had issues with the sludge and said also plastic components in cooling system got brittle because of it

With that said my 72 C10 6 cyl had Dexcool in it when I got it. Assume PO ran it. I have continued to use it without issue