I've got a 2017 Silverado with the 5.3. I only have a little over 300 miles on mine, but I really never even notice when it switches between V8 & V4 and back unless I happen to look at the DIC and notice it. Too early to tell about oil usage.
I had a 2007 Sierra 5.3/AFM with 92+k miles on it and it never used a drop of oil between changes. Everything was left stock on the truck from the day I bought it.....no tunes, no new exhaust etc.
I hope my 2017 fairs as well as the 2007.
I can definitely notice mine switch over. It's not as pronounced as the MSDS on the Ram that I owned, but I feel it. I think probably because if I'm light on the throttle, it will sometimes feel as though it's hesitating or trying to figure out whether to be in 4 or 8.
I'm going to add a little tidbit in here as well.
I had a 2007 Tahoe LTZ that suddenly went into limp mode and threw codes. Traction Control and Stabilitrak lights came on. I had a misfire on cylinder 1, because the intake valve was not opening.
I brought it in and they found the issue to be caused by the AFM. They said that it wore out the rockers and wore a lobe off the camshaft. They also told me this was a common problem due to the fact that you're essentially "dragging" along four cylinders when the motor goes into 4 cylinder mode.
The cost to tear down the motor was the same as to swap in a used one. This happened at 170,000 kms.
Like I said, they dealt with many of these same scenarios.
That being said, I bought a 2017 with the same feature, so obviously it didn't sway me from getting a new truck.
Perhaps this issue has been worked out in the newer generation motors?
Sent from my iPhone using Tapatalk
Edited by KA0S, 17 February 2017 - 12:50 PM.