Jeremiah,
It's not about blowing up an engine, but 'wearing it out' and that is subjective
Take a compression test to tell if the rings are worn, but won't tell if the
valve train is or not.
Performance is what is reduced and some can't tell the diff, while others can
You can blow up an engine if the lube hasn't been in good order (both schedule
and materials), but some don't blow and just make more noise to then blow up
sooner than later
Can tell when the engine oil needs changing on my Sub's 7.4L. It starts to
consume (doesn't consume a bit between regular changes) and the dash oil PSI
gauge is low and fluctuates. Still doesn't consume at +163K very HARD miles
Every wonder why most folks take care when buying used? Part of that has to
do with the previous owner(s) maintenance (intervals, materials, etc) and how
they drive. Why some have their mechanic check it out and one of the things
most mechanics do is a compression test.
Boils down to personal preferences...I'm on the synthetic side and
change sooner than later. I keep my vehicles for decades and decades
Folks who trade every few years really don't need to worry about this
Even towing heavy. Their downstream owner should worry...