My old '96 with 248k has gotten 5k oil changes since new and never needed any between changes. We are six weeks into vacation pulling this heavy fiver and after the last change in Vegas I had to add the first ever quart with 3500 on the last change. Have to say we have pulled some awesome mountains during this trip and never looked back. Engine temps never exceeded normal and kept the egt's workable also.
Tough old girl for sure.
Tough old girl for sure.