Yeah, I have yet to pull a sample on miles that I have ran. Planning to do so soon, between 15-20k; I'm at 14k now.
I do run under 1500 rpm. Usually run 62-65, so that's 1325ish to 1400 rpm on my setup. I wouldn't consider that lugging, but I'm not too familiar with the Series 60.
I thought his numbers looked fairly good for 1.11 million miles. I'm interested to see if my Lead and Tin continue to rise.
#12 sample was right before a new head was installed fyi.
And mine is finally running how it should now it has new charge air. 7,000 ish miles on new 3/4 engine. Finally seeing turbo/manifold combos true colors (non wg borg warner and ported/ceramic coated manifold). Let this dude get fully broke in and we will see how it is. Happy as hell now with it.
I typically stay above 1400 most of the time, but hardly ever over 1500 unless working a hard pull. Below 1400, the pyro climbs quite a bit on boost. 1400 has me on 61 mph, 1500 on 65 and I generally run at that range of speed unless I need to "put a wiggle in it" and get on around someone and not stay out in the hammer lane for 10 miles. My 12.7 60 has 672K on it as a factory reman. It gets 10w30 in the winter and 15w40 in the summer. With either one, I use about 2 qt of oil in 20-22,000 mile oil changes and been that way since day one when the engine got dropped in the truck. Only about 2 psi across the spectrum between the oils. Typically about 50 psi when running down the road on 15w40 and 48 psi on 10w30.