A quick web peek shows "dip stick tube heaters" ranging from 90 - 150 watts currently being offered for sale from various suppliers/sellers. If you want to read/learn more about the topic, type this "
engine oil dipstick tube heater" into your web browser search and you will see lots of info from various forums on the good, the bad and in some cases the ugly on the topic.
edit - Kevin beat me to the post button - lol!
