Hello, I am very new to the Diesel engines. I have the opportunity to buy a 1991 F Superduty DRW with the 7.3 Diesel in it. It has 142000 miles on it. It has a 12 ft flatbed on it. I am wanting a Truck to haul my 8900 lb 5th wheel trailer so I will want to change the bed. I can get it for a low price but is the 1991 7.3 a reliable engine? I have heard nothing but good about the 7.3's but not sure if there were good years and bad years. It says it has 180 hp and 345 ft lbs of torque which I believe would not have a problem pulling the 5th wheel. Anyone have knowledge about this year of engines? I heard Diesels can go 300000 miles. Is this true?