Engine Block Heater
I added an engine block heater. While I do not live in a cold climate, there are mornings that start below freezing. I also travel to snowy/cold climates.
The heater is not a required option, rather a "nice to have" one. Warm oil flows better (faster) through the engine, warm water heats (expands) the various metal components in the engine, getting the pieces to required clearances faster. In other words, the engine sees less wear.
Is the wear significant or negligible? That is a subject of great debate (not to be covered here.) I have been running block heaters for over 20 years, and figured I'd just continue.
Besides, I get warm air out of the heater faster!
I decided to use the Toyota heater, vs. a standard replace a freeze plug style. Since the block was designed for it, why not? The best part was I didn't have to drain the coolant to install it.
The only issue I had was a bracket holding the O2 sensor wire - it was right in the way. And, the 17mm bolt holding it to the engine was waaaay to tight.
Otherwise, nothing to the installation.
(No pictures of the installed unit - you can't really see it.)