I always say that there is no vehicle out there more abused than the US military cars, trucks, tanks, tracktors, etc... Lives depend on these vehicles, and if Mobil1 is good enough for them, it's good enough for me.
One test that hasn't been done is how these oils perform after 2000 miles. I heard RP's additives are good initially, but it doesn't last for a long time. Mobil1's additives last longer. Hence, I use RP because I change oil as often as the weather changes, so I benefit from than short term additive. I use Mobil1 on my Taurus and RX300 because I change those every 5,000 miles or so.
2007 GT Convertible •5 spd •450 rwhp 445 rwtq •Saleen Supercharged •C&L Racer CAI •Brenspeed Custom Dyno Tuned •3.73 FRPP •MGW Shifter •CHE K brace & torque limiters •Kooks 1 3/4" LT Headers 3" collectors 3" off road x-pipe •3" Magnaflow Magnapacks •18" FR500 Wheels •275 Rear Tires •GT500 Fuel Pump •Steeda Sports Springs •GT500 shocks struts front sway bar •Steeda LCA & pan hard bar •Slotted/Drilled Rotors •more... Stock exterior for effect! ░▒▓█