When we pulled the heads off our 198,*** miles 5.9 we bought for cheap, the cross hatches were plainly visible, no ridge at the top of the cylinder either. As you both said, FI and better oils are major contributors, and so is the overdrives. Durango's, Dakota's, and Ram's go down the road at 1400-1500 RPM's at 55 mph instead of 2200 RPM's like a 1980 D150. 600 RPM's every minutes is 36,000 less revolutions in 1 hr of travel at 55 mph. In just a 40 hrs of traveling is way over a million less revolutions. Now think of how many more revolutions the LA turns behind a 727 in a 150,*** miles vs the 5.2 with OD.