Yeah it's based out of the middle of no where and there isn't enough oil to change it themselves.
The pay is fantastic and the hours just as good. it is not skydiving ops, just many 1 - 3 hour legs in a day, and it is considered a private op.
The pilot is looking to quit because of the abrasive personality of he owner and the fact that he gets yelled at whenever he voices concerns.
Thanks for all the replies so far, they have been very enlightening.
The maintenance release stipulated the first oil change at a predetermined time, but not any subsequent ones. The engine is a Lycoming 540.
And yes, the pilot has no problems with the long days, but was still enquiring in the event of a logbook review or something similar.