Dumb Oil Heater Question

[Ron61]

Ok, for all of you guy's using motor oil heaters. What is the easiest kind to use ? Remember I live in Northern Calif. and we have few days that it gets below 15 degrees. I have talked to a couple of the local parts stores and they only seem to know about the kind that goes into the oil pan. I thought there was some kind of an electric blanket type wrap you could put around the pan but they said there is no such thing. My pan is not set up for an in pan heater and I don't want to pull it and start drilling holes to put one in. Any suggestions would be much appreciated.

Thanks,

Ron