Dexcool coolant - junk

I read about the problem with dexccol a while back on this forum.
I had same problem in February. The radiator filler neck was full of slimy brown deposit. Because somebody here mentioned about the dexcool tendency to break down and clog the system, I had a dealer to flush the cooling system out and refill with new anrifreeze, which they did but they put in dexcool coolant, telling me that Buick is designed only for this coolant and if I use anything else, I would be running into engine troubles. Bul..... I checked today under the radiator cap and there was again that smelly, brownish deposit. I clenaed out with paper towell as much as I could.
I am going to dump that stuff out and replace it with any other type of coolant. By the way, in order to get the system 'rinsed' really good, would it be a good idea to fill the system first with destilled water, drive for maybe 50 miles and refill with the 'blue' coolant ???
We used to do this in my old country (Czech republic) when we done the oil change. We used a rinsing oil first before we put a regular oil in.
Any input on this our technicians here ?

You WILL damage and overheat your engine is DEXCOOL is not used. Sliminess is normal.

You WILL damage and overheat your engine is DEXCOOL is not used. Sliminess is normal.

Thank you for stopping me from dumping the Dexcool. I will limit myself to periodically clean that offensive brownish deposit in filler neck. Mind you, the liquid in the plastic reservoir and radiator looks clean, I even put a clean wooden stick all the way down the plastic container and there was not any deposit after I pulled it out.
Thanks again!
Peter

Tman where did you hear that? We know what GM says. They cannot say anything negative, they are being sued. On all three of my cars. I dumped my dexcool several years ago. One of which is a 1989 that came with the green and I switched it over when dexcool was new. That was the only car that never had any trouble with dexcool???? Once I flushed/changed it out all that happened was I don't have any slime/gel in there. I think there is even a post from flatrater referencing this issue. Your service interval on the green stuff does drop to 2 years instead of 5. I have also done it for several other people over the last 6-7 years and have had no problems. GM motors and seals are made out of the same metals and silicone rubber compounds as other cars. I know most people never have a problem with dexcool but who wants to chance it?

Who told me? Morris Caldwell, GM certified mechanic for 20 some years. He don't look like much, but he can do anything on a GM car. There may be no adverse effects, but as you say, Why risk it? Not using Dexcool voids warranties in those vehicles still under them. To me, if GM reccommends it, chances are, I'm gonna use it.

I left it in my Century until the warranty ran out. But it was gelling up so I got rid of it. I think here in Florida it is the heat. When you shut off the car they often purge into the overflow and then you get hot coolant and fresh air. That seems to set off the stop leak in the DexCool. If mine had not gelled up in two out of three cars I would have left it in. But with my wife I gotta keep the car rolling. She would never see it heating up and stop. She will just keep going until it has fire coming out of it :-) At least I am the only one with that issue.

Since using the green stuff for a couple of years I have had no issues at all. No gel means better cooling and that also means less into the overflow. Life is good without worries. I just hear of people still under warranty who are needing head gaskets and intake gaskets, and GM says that it is their fault for letting the coolant level go low. That was not true in my case and I got gelled.

So in conclusion I guess it comes down to:

my wife+DexCool+my car+Florida heat=BAD

If I change any of these factors then it equals Good. DexCool was the cheapest to change. Later