Mike Rapoport wrote:





Where did you get the 50hr/4 month figure?

I got the 50hr or 4 month recommendation from Exxon for oil change and the
stated reason was that oil has the capibility of suspending some water and
after 4 months it would become saturated and corrosion could then begin.

Many people recommend 25 hours if you have no filter.
It's what the service information on my plane says.