Synthetic oil

..wow,that's a tough act to follow.
all my daily drivers for 35 years have gone up to 300k and only ever got dino oil,changed every 10 k or so.
although down on power they all ran well and didn't smoke when i sold them.
having said that, i run Amsoil in my Mopar and will probably never put more than 15 K on it total.....go figure

the trick is to control your hobby and not have your hobby control you...but that's no fun!