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Re: coolant vs. water
If there's no danger of freezing temps, you can use water, you obviously don't want it to freeze in your engine block. Antifreeze mixed with water will lower the freezing point as well as raise the boiling point of the water.
Do you know where the coolant is going? Are you aware of the intake manifold gasket problems on these cars? If coolant is leaking internally and ending up in your oil...you won't have to worry about it too long, because your engine will eventually fail.
Check your oil filler cap - any slimey gunk on there? Also check your coolant recovery tank - any slimey, dark oil residue in there? If so, you might want to do some research in this forum on intake manifold gasket.
BTW - I have a red '98 just like yours. Mine has 218,000.
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Current Grand Prix
2008 GP - 174,000
Former Grand Prix's
1994 GP SE - 231,000
1997 GP GT - 134,000
1998 GP GT - 225,000
2002 GP GT - 222,000
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