Synthetic 5w50 Schaefer oil

Mild, hydraulic flat tappet 360 in a truck that sees ALOT of mud and snow. Sustained load and rpm while toying around get it warm now and then. More interested in longevity then every last horsepower. I've liked the 50 weight and this stuff sounds like a decent oil and flows quicker then the dino oil when it gets cold in the mornings