My parents drive my old ‘94 3/4 ton Cheyenne that has 350,000+ on it; all highway miles. Original water pump and starter. I changed the alternator at 170,000. A 350 btw.
My ‘02 GMC has just over 200,000 on it atm (highway miles). Still purrs.
Oil changes are key.
Oil changes - bah. I had a 64 IH truck, it changed it’s own oil, every couple of fill-ups. Sucker went for 700k miles, that I know of.
Sniff. I miss it.