My ExxonMobil 2006 selection guide give a range of 0.80 to 0.86 for the various iterations of Mobil 1.
The SHC 600 series is 0.85 to 0.87.
Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity
Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity