I was looking over the oil analysis section and noticed that these engines have trouble with high lead content. Even with a Amsoil. So my situation is I have 195k on the motor and it runs extremly well with no noticable oil use or leaks. Would a good dino oil changed every 3000 miles be the best for this motor or should I use mobil one and change every 6 to 7 thousand miles, I will for sure use the motorcraft filter. Thanks for the input.