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Something to keep in mind that over the years the engine design has evolved with different materials and higher quality standards. The old cast iron block and heads are a thing of the past. So much research and development has gone into using the right materials and tolerances combined with varying FEA/CAE and countless tests in dyno labs. The same thing can be said for oil. It's not the same stuff that use to come out of a can that you had to puncture the top with a fancy spout.
I will confirm that when I worked in the dynamometer lab for one of the largest auto manufacturers in the world, most of the new engines had zero problem going to 10,000 miles with non-synthetic oil. This was measured via oil analysis, consumption and various life cycle testing. Do I remember the specific data... no (got out of powertrain as quickly as I could)... but I can confirm that this was the state of oil changes 5 years ago with an OEM...
Disclaimer: When I say engine design this includes the supporting systems and not just the block and heads.
BTW - I change my oil at what I think are reasonable levels. My daily driver is changed at every 3k because I do a lot of stop and go and I use non-synthetic. My Boxster will be changed once a year. Do I need to... probably not but I sleep better at night for some reason.
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