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Apparently Prestone Super Radiator Cleaner or Zerex Super Radiator Cleaner, each sold in 32 oz. bottles, are a lot better than their 10-minute flush products. You use them with just water in the cooling system and operate the engine for a total of 6-8 hours (can be spread out over a week) before draining. There are stronger products, but some aren’t meant to be used on aluminum radiators (almost all are aluminum) or aluminum engine blocks or heads.
I’ve been running Dexcool for about 20 years in my 1993 Ford Escort, and the previous owner of my 1986 Corolla started using it instead of Toyota red antifreeze at about the same time. No sludge in either of them. Could your Chevy 3.8L be affected by an intake manifold problem that makes coolant leak from a chemical reaction between Dexcool and the gasket? http://www.pontiacbonnevilleclub.com/forum/engine/topic1061.html
I put new pads on both front wheels but had just one rotor resurfaced. The other rotor was pretty scratched up (90,000 miles). Yet when I made some stops with my hands off the steering wheel, the truck stopped straight, even from up to 30 MPH. So I didn’t bother getting the other rotor turned. Did I simply get lucky, or is this the norm?