Living in Phoenix, I bought a house with a "built-in engine oil heater."

It's called an Uninsulated Garage.....100+ degrees in there during the day from May through October....

But no, in seriousness, I have not read of anyone installing an engine oil heater. Maybe a block heater. I'll Google something and post it here....

Dipstick-based engine oil heater, $15.99:

http://auto-parts.bagsfull.com/morei...item=54ZX1417P

or:

http://www.jcwhitney.com/webapp/wcs/...&storeId=10101