I have been running Shell Rotella T SB 100% Synthetic 0W-40 for a while now as well. Same as Roger I run it in my Ford diesel and in both 4Runners because I buy it by the 205L drum.

To alleviate my worries about warm oil pressure and my doubt's about the accuracy of the dash gauge I hooked up a Fluke 744 and pressure module set up to log 20 readings a minute for 6 hours. On a 91 22RE with 280,00km on it the lowest pressure seen after a 5 hour drive in 30+ Celsius weather with 20 minutes of idling outside the store at the end to keep the AC on was just over 10psi.