[Cliff R]

If you have a GM powered truck with AFM (or DFM for the later engines) and it's hasn't "lunched" a cam/lifters or you've lost some rod or main bearings consider yourself lucky.

The failure rate is high with those engines and don't think you are OK with the more recent DFM engines where they were supposed to have made changes to improve that deal.

The info I'm providing here are straight from two good friends of mine. One is the lead mechanic for over 30 years now at a dealership, the other a service writer at another dealership.

They have nearly new vehicles sitting out back of their dealerships waiting on engines. The supply has ran out and they have even went into the used market and exhausted that supply as well. One vehicle in particular was a pretty new 2500HD with the bigger 6.2 engine and it's been sitting out back several months waiting on an engine.

I already knew AFM was a chit set-up and have used tuners to disable it on several vehicles I've worked on and owned. AFM or the early version cancelled the inner 4 cylinders and eventually they start pumping oil if you keep it long enough. The newer DFM system is sequential but still prone to lifter failure(s) and wiping out camshafts. The newer engines are also experiencing main and rod bearing failures.

Not sure how all this is going to sort itself out? According to a quick Google search it's reported that a Class Action Lawsuite has been filed. I also read where GM is recalling some vehicles to upgrade the lifters. In any case it will be interesting to see how all this sort itself out........