What is the correct coolant to be using for my 03 TL? The "coolant" currently in use is a VERY dark blue. I just bought the car and am trying to go through it carefully and I actually have tried to search this forum for posts on coolant but haven't been able to find what I'm looking for. I would like to do a flush and fill but if what's in it now isn't regular coolant, then there may be other issues that I need to know about. I plan to add Prestone back to it, but if something different is called for then I want to use that instead. Thanks for any help and I'll continue to research as well.
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