Cm 870 head being replaced

[Craag]

Thanks guys. Wow wrong parts on an inframe? That is crazy. It's sad because you see the stealershit has Cummins certified signs up and your first instinct is to trust their "expertise." I got this gut feeling of dread when they started arguing about the .014" liner protrusion. They are pretty deep into it now though....
They just called me now as i was typing this and they have the head off and the linings are all at .009 to .010" and another inframe not needed. There's a surprise that they said that.
Is there better maintenance I could be doing to help this head and motor last? I do oil changes now by engine hour at 350 to 400 as my monthly mileage is low and PTO hours high. Maybe i should go 300 hrs? What about coolant flush how often should that be done? Cleaning the egr out? I hate to be "that guy" but considering I had the inframe of $30k done such a relatively short time ago it seems financially insane to delve into it again over .0004 to .0005". This is by no means doubting that it should be done to those 0014" specs. Just seems like a redundant and huge expense if the truck is running strong and the only issue is the head.