170k on my 97 Lumina, never done, just watch for coolant loss very
carefully.
"Al Haunts" <haunts@cogeco.ca> wrote in message
news:cumqp0tsm0hvp28ver5mcdmflbom87db0l@4ax.com...
> I'm well aware of the troublesome reputation of the intake gaskets on
> these engines.
>
> Would it be wise to replace the lower intake gaskets on a '99 3.1
> as a preventative measure, or do some of these engines actually live
> to a ripe old age without spitting-out the gaskets?? No signs of
> coolant leaks yet (97k miles).
>
> Regards, Al.
>
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