Hi
Do Oil companies use a base oil (synthetic) with the same viscosity for their multi grade oils?
What I mean is, let say Mobil sells 0W20,5W20, 0W30, 5W30,10W30, 0W40, 20W50 and etc.... Do the company use a base oil with the same viscosity and then play with the VI for their multi grade oil or they use different viscosity base oil (0Wxx,5Wxx,10Wxx or 20Wxx) and then use VI for the higher weight number ?
Do Oil companies use a base oil (synthetic) with the same viscosity for their multi grade oils?
What I mean is, let say Mobil sells 0W20,5W20, 0W30, 5W30,10W30, 0W40, 20W50 and etc.... Do the company use a base oil with the same viscosity and then play with the VI for their multi grade oil or they use different viscosity base oil (0Wxx,5Wxx,10Wxx or 20Wxx) and then use VI for the higher weight number ?
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