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there is no need to plug it in if you are not going to be driving it or starting it rather unless it is maybe one of those -15 below mornings.
0W-20 will never turn into "Molasses"...... This isn't 15W-40 like a big boy truck. I wouldn't worry about plugging in a LM2 unless it was sitting outside at -20, and only because it would warm up faster....
I just said that just for reference, It seemed like the OP thought maybe it did something more when plugged in.
I live in Texas, so the winters are not quite that cold. Although, as I write this, it's about 10° in Dallas. (I wish the government would take action about global cooling.) I spend my winters in Hawaii and my summers in California. I never do anything with any of my vehicles. One Tahoe, a Toyota, and a 2005 Ford Mustang convertible (NOT for sale). They start right up upon my return. On the Tahoe, the daytime running lights and engine stop start have been permanently disabled. I'm not sure if this matters much.
My dealer installed a block heater on my '18 6.2 L Yukon Denali. Was told it will not come on until it is below freezing; as from the post above, don't know if that is 0'C or 0'F, but it worked in Montana this weekend when it was brrrr outside.
Heaters must have gotten smarter since my days plugging up our freightliner. It was plug and play. No matter what the outside temp was, when you plug it up, it heats the block.
