I have the AFM disabled in the custom tune. I replaced the oil pump and O-ring with a HV/HP oil pump a while ago. I added all the aftermarket filtration in order to try and lower the oil pressure a bit as the ECM didn't like "seeing" the higher pressure. It's all covered in an earlier post.
Originally Posted by LeakySeals
I could have missed this. Sorry if already discussed. A 2008 5.3 has AFM. That system is prone to malfunction, the lifters wear themselves out grinding on the cam lobes. There can also be low oil pressure issues due to another common problem, the oil pickup tube oring fails. Oil flow is an issue with these engines. I would not use any type of filtration that restricts flow. The updated valve cover will hopefully help with oil consumption through cyl #7. But sometimes it's too late, rings are stuck and a soak helps