Isn't excessive idling a problem for many engines? I'd think that the lack of splashing and flinging oil at a 500 rpm idle would be trouble for any engine that relies on splash lubrication.
I have 368,000 miles on my 5.7 and the majority of those miles are at 65-80 mph commuting with the engine between 1800 and 2300 rpms. We are told to run the engine between 2500-3000 rpms to break in flat tappet cams so it seems that is the sweet spot to get oil flinging to the cam and lifters, right?