Err... I've been using the manufacturer's recommended (extended) oil change intervals since, well, when did Ford introduce the "bubble" Taurus design? Mid-1990s

Err... I've been using the manufacturer's recommended (extended) oil change intervals since, well, when did Ford introduce the "bubble" Taurus design? Mid-1990s? I've been using the vehicle's "oil-change-ometer" since I first got a vehicle with it, which means 10-15K mile intervals for me. Admittedly, that is a small sample of 4 vehicles (said Taurus, 2 Ford F150s, and the 2002 'Vette I used to use for commuting). I've never had an oil-related failure. And before you ask, yes, they're all high-mileage; for a while I was doing 25,000 miles/year.