I was changing my oil once a year, about 6000 miles. I had the oil analyzed at the end of last year and learned that the oil was good for at least another year. I will have it tested again this fall to see if I need to change it this year. Change the fuel filter about once a year and service the transmission every 30k miles with std type fluid, less often with synthetic fluids.
Robert L Rice
2002 36GD Journey DL