Recently purchased a 2003 Park Avenue Ultra with the supercharged 3800 V6 and see that it has slightly dirty orange coolant in it I assume to be DexCool? I really don't know much about coolant types but would it be okay to swap it all out with the green universal 50/50 stuff? I do the work myself and would rather use the green stuff since everything else I own already uses it. But the Buick owner's manual strongly advises DexCool only as it won't corrode aluminum parts and wear through seals, but, as I understand it, this car uses a cast iron block so will that matter? I honestly didn't know aluminum corroded at all, or is this just pressure paranoia crap to get you to use GM only products in the vehicle?
Thanks in advance y'all and have a happy 'n safe Easter weekend!
Thanks in advance y'all and have a happy 'n safe Easter weekend!