Have 1999 super duty F-250 7.3 diesel. something went wrong with torque converter at 38,000 miles, had ford rebuild it,they paid for it. All ok. Have 80,000 miles now. Using mercron fluid, change every 30,000 miles. Will start pulling 5th wheel camper soon. Am hearing about people using synthic mobil one tranmission fluid. Would this be something I should consider. I'm thinking this would help with temperature concerns on tranmission when pulling RV. Looking for recomendations on products and etc.