I am with you I may be old fashiioned but I change my oil and filter at 4k when towing with my CTD. I have always thought of oil as the least expensive form of preventive maint. you can do. In all of my years of driving and owning all sorts of motor vehs. I have not had a problem. Many dealers have quick change lanes open 6 days a week at their dealerships. There are other oil change shops. I have also had my oil changed at Wal Mart. and I have never had a problem. I use Rotella and I inform whoever is going to do the work that. Good luck.