I have an 02 F350 Super Duty. There are no mods on it. I bought it from a guy and he told me it ran great and then I went to start it one day and it kept stalling on me. Soon to find out it was out of oil. It was going through 3 qt a day easily somtimes more. So I had a "powerstroke" man change the outter o'rings on the injectors and said that would fix it. It did not and it is still using excessive oil. I took it back to the guy and he said that there are o'rings on the inside of the injectors and I need to buy new injectors to fix that for $1,200. There are no puddles when it sits. Doesn't white smoke at all. And the undercarriage is spotless. Any ideas?