[Z71]

My 2005 has 22,000 miles and has never used any oil. I change it once a year at approximately 7,500 miles which has never been less the 40% life remaining. I use Amsoil 0W-30 and the oil level never moves.


Are you using synthetic oil?

Which brand?

Some brands of oil will burn off (volatility) worse then others, try changing to another at next change to see if it improves.