The first one refers to the infamous leaking intake manifold gasket problem
on the 3.1L and 3.4L engine. It advises that a new intake manifold gasket,
part# 89017279 is available which should have better sealing.
The second one states that new piston assemblies with polymer coating are
available for the 3.1 and 3.4 engines and should be used whenever piston
replacement is necessary. It doesn't mention why, but it's presumably to
address the piston slap and/or piston scuffing problems that some of these
engines have had.
Robert Hancock Saskatoon, SK, Canada
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