your 98 SHOULD have come with Dex from the factory. i guess they clai the Dex is a problem on the LIM gaskets and other gaskets but then again you read members here who have loged many thousands of miles with no problems. i think it just needs to be kept full and changed more often than GM says, but what do I know

Coolant should be flushed and changed every 3 years for the old green stuff, every 5 years for Dex or the new yellow "mixes with any" stuff.

The rust inhibitors become depleted over time and the cast iron block and heads can start to rust and pit. The rust builds up in the cooling system and can clog the radiator core and heater core. Aluminum parts can also corrode when the coolant is too old. So, there is more at stake than the water pump.

Dex has such a horrible reputation, that I cannot recommend anyone use it. Dex has been known to break down and attack engine gaskets well before the 5-year anticipated life. So, to be safe, I recommend Dex be flushed out and replaced with the newer "mixes with any color or type" coolant.

Bill, is it safe to assume when you say Dex, you are NOT meaning The Prestone LL Dex compatable ?
Thanks

He said DEX. Not Prestone. And from our general experience here, as well as the class-action lawsuit, DEX should be removed and never put back in.

Ok, so far, what is the verdict on this? Could this possibly be prematurely damaging my gaskets? I have always thought the same as boost is stating. I was under the direct impression that this is only DEX COMPATIBLE, NOT DEX-COOL. If it were dex cool, wouldn't it say ONLY for GM vehicles, what is it...1995 and above?

All I need to know is, do I need to get this stuff out of my cooling system?!?? I have been running it 70-30 mix for 18 months!

Also, Don, are you pulling the top end off the LN3 or just the L36, if you have been running it in one of the LN3s I would be VERY interested to see the LIM gasket.

Why are you running DEX? Made by GM? That'* the worst thing you could possibly use. And a 70/30 mix? Why?

You should be using the green stuff. Nothing else.

Don is testing the DEX-compatible Prestone longlife in the 95.

Am I crazy here,lol Will said "he said DEx NOT Prestone" Ok so JR said in prior posts he will "continue to use Dex, never had any problems " and that he stated was in thousands of miles, now If he ment GM DEX NOT Prestone, like Will stated he ment, why is Will stating in his post above Dex is the worst do not use it .. This is sure puzzling. Many dealers have told me NOT to use the green in these motors due to the high aluminum content so I never have. I am wondering if JR had some problems with the Dex AFTER his posts and I jsut didn't find the right post.. Oh well Im hoping He Himself will post why the sudden change in his opinion. I am still probably going to try thr Prestone LL as I don't want to go to the dealer and buy GM Dex. Let us know JR .. Please.. Thank you

jr's3800 had problems with DEX. He is running DEX compatible Prestone Long-life and has for about 2 years.

The Dealer will NOT tell you DEX is the devil. They rely on GM for their paycheck. Please read the DEX sticky in General Chat regarding the class-action lawsuit, and listen to the experiences of the Gearheads and other members of this Forum that have been victimized by DEX.

Oh, i must have not seen the post saying he had problems. The post i read and attached said he had been using Dex for years, 7 I believe, with no problems. And also knew people that had thousands of miles on Dex. I have read every post on the net I could and some say is no problem others say its the "devil" When did JR start having trouble and what was the trouble ? I still say I will try the PLL, Thanks Will for your input . There is tons of reading on the net. I hope the PLL is a good sub but I guess im still confused as to why JR said No problems, now hes trying PLL ? Oh well im sure he will chime in

Not a good reason to run orange for most BC members. 3800 Bonneville engines have cast iron blocks, cast iron heads, al LIM, water pump and fittings. Not high aluminum content compared to many modern engines.