I have a 00 silverado with the seemingly indestructible 5.3. Between 2006 and 11 it went from 70,000 to 296k at an oilfield company. Bought because i thought it had bad oil pressure but it just had a bad gauge. Ran a little rough so changed plugs and wires, may have been original if not changed once with oem acdelcos. Overall putting 2k lbs in it over every couple of weeks and carrying a couple hundred at a time daily. Its been a great little work truck. Also is basically all stock. Currently has 305k and running strong