I don't understand the discussions on water in the crankcase. A few
questions are:
       1. How hot is the exhaust gas venting from the crankcase? As hot as
the cylinder head?
       2. What is the dew point of the exhaust gas?
       3. Don't all engines have a crankcase vent? Why open the dipstick? To
create a circulation?

I would have thought that the only time we have a problem with water in the
crankcase is with the cold engine and at shutdown. The gas in the crankcase
at shutdown could cool to the dewpoint and deposit water, unless it is
displaced with drier air.

I would think that the water condensed on a cold start would quickly be
evaporated when the engine is up to temperature. Notice, I think I am
talking about evaporation not boiling.

I think I will try and measure the temp at the vent and maybe calculate or
measure the dew point. I would also guess that the hot CO2 and CO in the
exhaust are corrosive even in the presence of only water vapor??