I just traded in a 2002 Ford F-150 SuperCrew 4x4 5.4L Triton V8 gas, 285,761 miles. I did an oil change using Mobile1 & NAPA Platinum filter the day I drove it home, and ONCE a YEAR thereafter... pulled a 36ft Travel Trailer everywhere, beat the shit outta that truck I loved, 4x4'd in mud, mountains, woods and rivers! With 38" BFG's and lifted 12" I only got about 10-12 mpg in the city, but on the highway, averaged 32-34 mpg. Had to replace the Trans around 182,000 miles, but NEVER had any issues with the engine.