rattleonby
Full Access Member
I have a 7.3 IDI and it came with red coolant. I'm guessing its probably fleet coolant or something of the sort. I was wondering if its true that the "red" coolant eats away at the head gaskets with or without additives. I've heard both sides of this story and just wanted some guidance and/or experience in this area as to what the best coolant is to run in a stock idi...