Condensation is common, especially in cool damp weather. It's usually not a
problem if the engine is allowed to run long enough at normal engine temps
to let it evaporate. Engines that mainly are used for short trips can build
up condensation and may need more frequent oil changes. A weekly 20 mile
round trip at hwy speeds can alleviate the problem.
Respectfully, if it is condensation, then you wouldnt know if it came from
antifreeze or not.
A leak into the engine crankcase from the cooling system
is usually easy to see by checking the condition of the oil and noting
I suspect yours is condensation from the atmosphere, BUT that engine is
susceptible to the plenum failure problem.
I keep an eye on the antifreeze level and get the oil analyzed one in awhile
for piece of mind. I've heard (from Ian) that my engine most likely has the
EGR fix, and that even though the plenum can leak from other places, he
hasn't seen many that actually do that.
I do live in a cold climate (upstate NY) and have for many years, but have
never seen this before with my other cars. On the other hand, none of them
had an obvious place like that for condensation to collect like the Impala
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