Was just watching Motorweek on Speed channel and they were interviewing Rusty Wallace and he was asked about the myth of Nascar using Synthetic 50W oils during racing. Rusty then came on and said many positives about how they run the M1 0W-30R oil and how great it was over the old 50W synthetics. He mentioned that the 0W viscosity really helped the bearings in the motor better than the thicker weight oils. BTW the Motorweek editor was holding a new bottle of Mobil 1R 0W-30 in his hands! Looked like a cool looking bottle!