I was running Rotella, but after they reformulated, I quit. I'm back to running Pennsoil 10w30 with a bottle of ZDDPlus.
If your engine has good oil pressure, running a thicker oil than specified is just going to make more heat and cost you some horsepower.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph