My '08 5.3 would go through 1 quart every 1000 miles until I turned off the AFM. No it uses about 1/2 qt between oil changes. It stared burning oil at around 50,000 miles. Other than that, it's been a great motor. I didn't loose any MPG after turning the AFM off either.
Last edited by gundoc; 04/04/18 10:19 AM.
