nrp wrote:

Peter R - A very interesting idea - does the rag actually get wet? I
wouldn't think there would be enough natural draft to flush the
crankcase of a hot engine with only the breather to supply air.

Perhaps not (I am not an A&P), but I suspect that even this little bit is
better than leaving the oil cap tightly secured on cold days. Yes, the rag
is noticeably damp after a 1/2 day or so the aircraft sitting on a ramp
where temps are below about 30 degrees F. After a couple of days, the rag
is discolored slightly brown, but dry.

To put it another way, I am only about 150 hours into a newly rebuilt
engine, so I will hang charm bracelets off the cowling if the action will
result in a few more hours of useful engine life.

--
Peter
























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