What is the difference between the two viscosity readings at the bottom of the report? Is the cSt reading comparable to the viscosity rating given on the containers (i.e. 5W-30)? The report comments are comparing this oil to a 5W-20 at the mileage on the oil, but I'm not really seeing where in the report it's suggesting this. If it's the viscosity, why is it not closer to 20 instead of 8?