As stated above, Dexcool can cause a host of problems. At our shop, we use Zerex G-05 whenever a long-life coolant is recommended. If a car originally had green, we use that. We have had no problems due to the HOAT G-05. We've flushed quite a few to get rid of the Dexcool. We even found out our local Chevy house gets rid of the stuff from customer's cars after the warranty period expires.

My mother-in-laws car plugged up two heater cores by using Dexcool in her '96 Caprice. We even installed a spin-on coolant filter to remedy it. No dice. She drives a Lincoln Town Car, now.

Mark