FWIW,
I flushed both the coolant system and my seperated intercooler system with the Prestone flush. Then refilled 50/50 with G05 coolant & distilled water also added a Water Wetter product to it.

Only use a HOAT coolant (Hybrid Organic Acid Technology) - ie. G05. The Dexcool and others are OAT which is for aluminum, but causes premature water pump failures. The 'Hybrid' stuff is the latest & greatest...

And yup, NAPA was the only place I could find the Zerex G05. It was only $9.50/gal.