Gotta disagree on some of that from my findings.. millers 10w 60 or castrol edge 10w 60 keep much better pressure, silkolene seemed good enough but just doesnt last long at all before degrading and the pressure starts to drop.
I understand what u r saying but SILKOLENE keep it's viscosity at higher temperatures where some other oils lose their viscosity far quicker,Castrol being one of them.
I cannot comment on the Millers but I have heard it's good stuff.
CheeRS.Lee.