How long is your dipstick ?

[Vitis805]

Maybe I'm missing your point, but this is exactly what you want happening inside a "rich" engine.

Totally, back in the day. What is best now in our modern turbo DI engines is drive it for at least twenty minutes and get the best of all worlds; not as much re-introduced fuel to the oil (leaner operation), more time and higher temps to burn off vapors, and the unburned vapors burning off through the advanced PCV system with increased airflow that will help with limiting the coking of the valves. Our PCV system is not simply just a check-valve like the days of old. We also have a bypass valve that will route the vapors properly when the turbo is not creating enough vacuum like how you mentioned.

The catch cans fill up faster in the winter due to Thermal Difference and the laws of condensation.

Absolutely. Water levels are increased through condensation, but also fuel from longer idle times. It would be interesting to analyze the percent of contents in a catch can from summer to winter.

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