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The general aviation industry is a huge proponent of preheating. I will not an air cooled aviation engine below about 40df OAT unless it has been preheated.
Our cars run more sophisticated oils, but I am still not a fan of running the car with oil that's below 40df. This is only because my commute in starts with some fantastic back roads, and it is difficult to keep my foot out of it for the first 10 mins.
I disagree with Jeff in PA, I believe a block heater would most definitely heat you oil over time, just as a sump heater will heat the block over time.
Sump heaters are cheap and can be glued to the the pan for semi-permanent installation.
Heating your oil before start up can do nothing but good...
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