I changed the oil in my O470R this weekend. 24.5 tach hours
and 4 months from the last oil change. I use AeroShell 100W+,
which is a 50 weight ashless oil (the one with the gold coloured
label).

After flying around for an hour or so to warm it up before draining,
I happened to notice that oil on the dip-stick is 'beading', rather
like raindrops on a window pane.

Am I right in thinking that this oil has wetting additives that have
boiled off in use?