Read a post recently from someone looking for a oil pan heater. I found this an ad in Flying magazine for aircraft oil heaters. They cost around $ 160. 00, not bad for something that goes on an aircraft. They will heat six quarts of oil to 150° I don’t know how they would do with 12 quarts. The they attach to the pan or block. Might be worth a look if you want a oil heater. It’s called the Hot Strip or Hot Pad from Reiff Preheat Systems. (262) 968-2342 or http://www.reiffpreheat.com/product.htm Jeff