Roush 427R oil question?

[ha_pe_1968]

Was talking with the Olthoffs when i bought my car with a Roush 427R.
There suggestion was:
Routine: 10W40 Winter, 20W50 Summer
High Speed: Mobil 1 10W30 or 15W50

I am only driving in Summer so i will take Valvoline VR1 20W50

Mobil 1 in this Viscosity is not available in my area.

Peter

[Chilibit]

I use 10-40 Shell Rotella Triple and the motor seems to like it. I will say that rather than high speed, higher RPMs drive the oil temps up. Sustained above 4k rpm the motor builds heat in the oil, more so with Rotella than Mobil 1 20-50. Oil consumption is higher with Mobil 1 despite the viscosity. My starting cold oil pressure is 60 at 2000 rpm and after it is fully warm it settles in at 48-50 above 2000, and idle pressure goes to 42-45 at 100C. I am comfortable at those pressures and I tend to short shift till get at least 80C in the oil.

Roush says 10-30 but at 10-30 my hot idle pressure is lower. Too low? Probably not. But it makes me less comfortable. Everyone seems to worry about the track but I find that 5k rpm, second gear, climbing over the mountains on twisty roads is much harder on the temperatures. Air flow is pretty low. It is my favorite place to be.