If you tow stuff in excess of 1500 pounds a half dozen or so times per year and do not have the towing package, you may wish to consider fluid and filter change every 15-20K or so. We tow our Coleman popup 6-10 times per year for about 1000 miles total. We drop the pan every 15k, without fail. So far, so good. Too often is WAY better and less expensive than not often enough. Been there and done that, twice.