2001 Buick coolent

My 2001 Buick Century seems to use a small amount of coolent. The overflow tank was about a quart low today. I changer the coolent at 75000 miles (87000 now). Does the 3.1 engine have a history of
this problem. There are no leaks that I can see and have not seen any water in tailpipe after car is driven. thanks Ernis
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Hi Erbie Hate to say it, but the GM 3.1 is known for bad intake manifold gaskets. Do a "Google" search on Buick 3.1 coolant leak!!
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