I'm using Hughes roller lifters and

sticking with the dino oil works especially with a carb engine where you get choke and cold wash down just change it regularly
However the $20 a jug synthetic at wal mart in 0-30 will show less wear over time as it protects better at start up even in a warm state oil is still "cold"
BTW in tests we did for the local fire department starting and ideling the trucks to "warm them up" cost $$$ big time compared to start- drive easy- backit down (creating a vacuum) and back up a few times and go- changed the oil too
oil analysis etc. The oil never got warm ideling- just the water
and this is So Cal not in the mountains