Well, I'm leaning that I don't have AFM. My DIC has never shown 8/4 mode. On the engine cover it only says "Vortec" and nothing else. Owners Manual says nothing about AFM anywhere. I'm pretty sure I have an Iron block to boot. According to Wikipedia Vortec engines with AFM were first produced in ...

I have a 2007 Classic Silverado with a 5.3 in it. 8th digit in the VIN is a "T". I need to know if my truck is infected with AFM and if so how can I disable it? It's being reported that Chevy's are burning oil like mad when they start hitting about the 40k milage mark. On the order of 1qt every 2k ...