In response to the comment that running an engine cooler is better, to an Engineer:
This Engineer knows that higher block temperatures result in the combustion reaction being closer to "adiabatic", which means the heat from the reaction is not transferred to the engine block, but instead used to push the piston down, and turn the crankshaft.
Also, having high engine temperatures usually results in less build up of crud in the oil. (That is the car mechanic talking, not the Engineer.)
My $.02 worth. Take it for what it is worth.

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1989 560SEL
1971 Cutlass convt. (sold)
1978 Olds Toronado (sold)
the rest are boring