How good are dipstick oil heaters?
Headed out for another winter trip to Bryce Canyon on Valentine's Day and don't want a repeat of the problem I had on the 7° road trip starting in the morning with thick oil. Not going to change the oil for one more cold start so want to heat the oil overnight instead. I'm familiar with dipstick heaters, magnetic oil pan heaters, and the coolant heaters. I like the idea of the dipstick heater as it seems the easiest to install and remove, and cheapest. They're 90 watts. Has anyone used one in really cold (single digit F) temperatures and had it work OK?
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Prof. Henry (The Roaming Gnome) 
"It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness
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