[puddleglum]

I really think both oil and coolant heaters have their merits. Warm oil not only flows easier (reducing wear) but it will transmit that heat up through the block. Heat does rise after all. I agree that oil heaters are not as quick at heating the head as a coolant heater though. I currently run the 400w factory coolant heater along with a 150w pad style oil pan heater on the engine (like the one in Doax' post) and a 50w pad heater on the transmission. I also have a grill block and an insulated belly pan, both for Aero improvement and to keep as much heat in as possible. Most of my trips are short (1-4 miles) so it makes a noticeable difference at anything below about 5*C. Above that I'm not sure if the gas savings offset the power cost or not.