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Even in Atlanta it takes 25 minutes of street driving to get the oil to normal temp in the winter. 9.5 quarts needs a lot of heat to get to 180F. At the track, it only takes a lap to get it above normal street temperature on the IS F. Not sure about the RC and GS cars because they have an additional thermostatically controlled air/oil cooler the IS does not have.
There's been several times that the oil temperature wasn't all the way up to the normal operating temperature even after driving 30 highway miles back to my apartment at 80 mph. That's also after 10 minutes at idle from my pre-start. The coolant temperature warms up fairly quickly though.