The owners manual of the Ford V-10 engine calls for oil changes at 5,000-mile intervals. I know this was previously 3,000-mile intervals and I think that's preferable but DW says I worry needlessly. ...
Since we usually put less than 4000 miles a year on our motorhome I change oil and filter every fall right before it goes into storage and winterize it at the same time. That way its ready to go in the spring...