>>
>>> >>>
>>>> Minimum 20 minutes to get the oil to full operating temperature, and
>>>> then about another 10 minutes for every day of short run cold morning, >>>
>>>
>>>
>>> When your coolant has reached OT and the thermostat is open, the oil has
>>> reached operating temperature some time before that. It's basic heat
>>> transfer. If it had not, the coolant and engine block would still be
>>> warming the oil and the Tstat would remain close.
>
>> Wrong. The oil takes much longer to reach operating temp than the
>> coolant. Want proof, just wait till the thermostat opens and feel the bottom
>> of the oil pan, still not hot is it ?
>
>The oil is circulating, not sitting in the pan warming it up. The pan is
>where oil cools for the next go around. The pan should be cooler than the
>oil circulating in the engine.
>
But the oil in the pan needs to reach operating temperature to drive out the moisture accumulated by short cold runs.