What makes the cold cranks so good in UCBOs?
The resistance of an oil to engine cranking at low temperatures (which is measured as the viscosity in the Cold Cranking Simulator (CCS) test [ASTM D 5293]) is controlled largely by the additives in the oil and the VI of the base oil. At low temperatures, high-VI Chevron UCBOs are less viscous than conventional base oils which translates into less resistance to engine cranking.
