I looked further into this. AFM was credited with causing excessive oil use/loss and as best I can tell 2007 was the first year for truck engines. GM finally developed some sort of "shield" to prevent oil loss for 2007 through 20011 vehicles but it hasn't completely eliminated the problem.
Granted I got this info from a tundraheadquarters.com article written in Sept 2013 but it appeared pretty well documented with info that came from GM and other sources. The article also indicated Honda was having some problems with similar technology.
Last edited by 43Shooter; 11/16/14.
