I was just watching Bobby Likis and reading through the coolant section and google searches. I'm afraid for my cooling system in my cavalier now. Three years ago my grandfather had the cooling system drained (Its I believe 10y/150 coolant) so it was the first time ever. I don't know what was in it before, but now it has Red Dex-Cool coolant in it, and I am afraid one of these times I'm going to pop the hood and find it sludged up inside. Should I be worried? Should I change to a non Dex-Cool coolant? Or am I just going with the Sheeple and getting worried about nothing?