While waiting for my rotors to be turned, I was bored so I'll chime in. Here's what I have both read and what I've heard first hand from Richard Winkles, the lead engine developer for the Viper since 92'. Basically, when referring to a good engine that's not worn out, low pressure can be bad during track events. Low pressure can mean the oil is too hot and has thinned to the point it isn't circulating well enough for the demands of the engine. Thinner oil exhibits lower pressure and sometimes means the engine isn't being protected as much because the oil is both thinner and moving less. Think of it this way, picture the oil pump moving a volume of oil, then picture it moving a volume of air. It won't move as much air because it's thinner and the oil pump can't maintain pressure. So the hotter your oil gets, the thinner it gets, the less protection it gives. That's why we put 15w-50 race fluid in our Vipers for track days. I was having issues where my RT/10 oil pressure would drop to 25PSI after a couple of laps and my check engine light would flash rapidly. Richard Winkles told my to put 15w-50 and my pressure never dropped below 40PSI after that.

By the way, Mobile 1 today is not what it used to be. It has less protection than in the past and because of this, all SRT vehicles will be switching over to Pennzoil Ultra 0w-40 starting with the 2013 Viper. Some of us thought it was a marketing stunt, but Richard Winkles claims the engineers found it protects better than the current Mobile 1.

New Pennzoil UltraTM 0W-40 Designed For All SRT Vehicles

P.S. O'Reilly has a sale on Mobile 1 0w-40 5.1 quart jugs. I just bought four for $27.45 each.