popimp - where do you live, and how long is a typical trip in the car?
If the answers are "somewhere cold" and "short", then a block heater would be worthwhile. You'll need something that packs a punch though - no wimpy 300w units.
I've installed a few and they vary from intermediate to difficult, depending on the type you get. (The best ones warm the coolant directly - vs. bolt-on or magnetic radiant heaters.)
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