University of Athens, University of Auckland, United Ostomy Association, University of Arizona, University Orthopedic Associates.
And no I haven't, but then again I haven't run Dino Oil in over Forty years. When I did it was changed every 2500 to 3000 miles.
We all have choices and just because someone doesn't agree with your choice doesn't make them stupid. I may chose to drive a Corvette while you're happy driving a Chevette. Just think how boring it would be if we all dressed alike, lived in identical homes, drove identical cars, etc.