Newer vehicles (diesels) are much more complicated. I traded a 2006 GMC Duramax/Allison 3/4 ton for a 2016 Powerstroke. My 2006 only had oil changes and regular maintenance, my 2016 has had a water pump replaced at 18,000 miles, sensors go bad, 3 days of work on a Ford TSB at 4,000 miles new, a coolant leak at 40,000 miles etc. etc. It had enough problems that I decided to purchase a Ford bumper-bumper extended warranty.
If your loads are not too heavy, look at the new gassers (the 7.3L Ford and the 6.6L Chevy). Someone had a video of both engines under the hood, the gasser is half the parts and you can see the ground through it, the diesels are so crammed in, it is a miracle any work gets done on them... Just my $0.02
