I’m not saying the engine will self destruct at 5,001 miles, but over time and with lack of diligence (6,500 Miles here, 7,100 miles there...what’s another couple hundred miles gonna hurt...) varnish can be deposited, and varnish accumulates. All the sudden you have accumulated a few oil changes worth of varnish and your oil control valve screens have clogged up and you have a CEL with a P0011 or P0014 and you’re saying what the.... happened! I never went more than 7,500 miles! Not to mention 6,000 miles a year is likely in town short trip pattern, and short tripping causes condensation to form and not get burned off in the crankcase. Condensation mixed with combustion byproduct creates bearing eating acids. Not worth it to me.
Average engine replacement at my dealership runs about $5,000. Two $40 oil changes a year (which I never pay, my oil changes cost me between $10 and $20) would take 62.5 years to reach a cost equilibrium. So yes, it would take over 62 years to make “over changing your oil” cost more than replacing your engine. It’s cheaper than car insurance, which you may never use.