Read the labels at the FLAPS and you will find many, if not all, the
current green formulations are compatible with the DexCool chemistry.
A lot of people on here made claims that DexCool and the old green
formulation were disastrously incompatible, but these usually seemed
to be unfounded claims.
On a car that old, I would drain and flush the block and radiator, just
to wash out any trash, rust, etc that may have accumulated. Then
refill with coolant of your choice. I have honestly never been very
impressed by the DexCool. The reason is the protection of aluminum
alloys , which was pretty decent with the green silicate formulations.
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