I just clocked 300K miles on my 2001 Chevy Silverado 5.3L V8. I bought her in 2002 with 22K miles on it. I performed all the scheduled maintenance and fluid changes during the years. I had to replace two water pumps (lifetime warranty), two fuel pumps, alternator and changed the spark plugs once. I used all Chevy OEM parts. She gets 14mpg city and 17mpg highway. I'm ready for a Chevy commercial......LIKE A ROCK!!!!