Hydraulic roller oil?
What kind of oil is everyone using with their hydraulic roller cams?
IMO it depends on the rest of the motor.
If it's an older LA converted to roller I would say 10/40 or 20/50
A newer motor like a magnum then around 5-10/30 full synthetic.
I run 5-30 Castrol Syntec in my Magnum because it was machined for synthetic when it was made.
I like to run an oil viscosity that when at temp running down the road my oil pressure is around 5-10 lbs less than the cold start pressures.
This tells me I'm not letting oil bypass, and that I have a good amount of flow through things.
My thoughts on it are a little lower pressures at temp because of a thinner viscosity means the bearings are getting the best flow of oil through them.
I firmly believe flow volume is more important than pressure.