It's winter time again. Thought I would post this up since the topic will come up again. I did this test a few years ago.
A lot of folks use a timer to control costs and use for when the truck is needed daily.This morning I plugged the block heater in. My Scangauge read 39 degrees.
1 hour later it was 80 degrees.
2 hours later was 94 degrees.
3 hours later it was 103 degrees.
4 hours later it was 110 degrees.
5 hours later it was 116 degrees.
Yes, 39 isn't that cold to start, but was interesting to see that it went from 39 to 80 in an hour.
Currently my oil temp in hour 3 is 77 degrees. It was 40 at starting point.
Oil temp after 4 hours is 91 degrees.