Submitted on 07/26/22 at 1:30 am
I have heard this gossip as well. From my research, problems will be encountered only when mixing coolant types. I personally have only used Dex-Cool in my LS engines. The horror stories I have read about have included mixing the green and orange coolant without doing a complete flush. I don’t know enough about the “Global” coolant to answer the question with confidence. I do know if you are going to switch coolant types, be very sure ALL the old coolant is out. This includes the coolant trapped in the heater core. Mixing coolant types will do far more damage than using what the factory calls for ever will. Give the radiator a drain every couple of years and put in some fresh coolant and you should never see a problem.