Assume Pennzoil Platinum dexos1 Gen 2 0W-20 with typical cSt @ 40Â°C of 43.4 and typical cSt @ 100Â° of 8.6 per the TDS. If these viscosity numbers are put in to the NiMAC calculator (Andrade correlation) and 85Â°C is used as the operating temperature, the calculated viscosity is 11.78. (Realizing that various factors may cause the result to to slightly more or less, let's assume the 11.78 is accurate.) If the oil temperature in my car runs at 85Â°C (which it averaged on a recent 200 mile road trip), is the 11.78 cSt the equivalent of having an SAE 30 grade oil in the engine? Put another way, will an 11.78 Cst @ 85Â°C oil have the same functionality/characteristics/properties as an 11.78 cSt @ 100Â°C oil?