Oil on front cowl
I part own a Piper Archer2. Recently we have noticed every time we go flying we have an oil smear on the Starboard side of the engine cowl (bottom half of cowling behind the prop but about spinner height) . At first we thought it must be an outside culprit like another aircraft blowing it back but no it is from our engine somewhere. I am at loss to see how this gets forward of the engine,but must be prop wash doing it. We can't see a leak anywhere and are not loosing any great amount of oil. Can anyone shed any light on where this maybe coming from? I am betting someone else has had the same problem at some point. Any help would be appreciated.