Just one more person to tell you.....

I usually jsut leave mine plugged in all night, its easier, and besides, the block heater only draws around 250watts, so its like leaving 3 lights on in your house all night. As far as the oil goes, I run 15W-40 all year, and it gets below -20 Deg F here and I never have a problem even when I am not near a plug, just have to give her a little throttle to help her get going!! Low weight Diesel engine oil is scarce here in the mountains.....Oh, use a non-gelling agent in your fuel!!!