zatatime wrote in message . ..
I fly my bird about 50 hours per year. I was taught by an old-timer
that 50 hours was fine for oil changes and that a year was an
acceptable calendar period.

The general recommendation for the average ContiLycosaurus is 25
hours if you have no filter, or 50 hrs. if you have one. I remember
reading a Lyc. manual or tech document that recommended a maximum of 4
months between changes. Presumably, this was to get rid of the
build-up of acids in the oil that are a byproduct of combustion.

John Galban=====N4BQ (PA28-180)