94 cabriolet sludge question

[Dave C]

Zaf writes...
"I am helping to maintain a friends 94 cabrio V6.
I changed the oil yesterday and found a creamy tan sludge on
the bottom of the oil filler cap. "

Zaf,
This is a common indicator of a stuck thermostat which never lets the
engine reach normal operating temperature.  Assuming you are in a region
that gets cold this time of year, ask her how well her heater works.  It
should put out nice toasty heat.  If not, then the thermostat needs to be
changed.
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Dave C.