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Sorry for my misunderstanding but I am not so sure if I read you correct: the car is 97, the radiater is 2 years old? and the coolant has never been changed? How? and yes I would stick with the original as you and Schilke said.
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car is a 95 e34. my sister crashed it about 2 years ago (2oo1 or 2002, i forget) and had to have a new radiator. so the radiator is about 2 years old, and hasnt had a coolant change since it was put in (well, now it has). i bought bmw blue cause i thought it was blue, but it came out green? so hopefully the green and blue dont sludge. if it does...how would i unsludge it, lol.
