What should I do to help preserve my car?

They have oil heaters that you can leave plugged in to keep the oil warm enough to help with cold weather starts. Other than that time for a trade in!

I believe they also have a heated oil dipstick you can place in your engines oil check level. its run off house electricity and keeps the engine warm from inside.

@john65pennington I’ve had to use those before. Not bad if it’s only a little cold (nothing worse than -25F)!

In Alaska, you really need both a block heater and oil pan heater. You also need maximum antifreeze protection. Temperatures can get so low that batteries lack cranking power, so there are heater blankets for those. These things can get the motor started; in really cold temperatures (like Fairbanks), you might have trouble shifting gears unless you change to a very lightweight transmission fluid or gear oil. You will also need a cover for your radiator, my Power Wagon that I used at Ft Wainwright had a radiator cover that worked like venetian blinds and could be opened and closed from the cab.

@stranger_in_a_strange_land Even in NH and Seattle, I am known to occasionally block of at least part of my radiator during certain times of the year, especially with a late-80s Corolla (they are quite prone to overcooling if it’s less than 50F outside).
Additionally, I always sprung for a bigger battery, often the biggest that I could get for whatever model car I have at the time. See, some people think that 550 cold cranking amps is enough for a 1.6L four-banger, and it is… if you live someplace where snow doesn’t exist. That 550A measurement is taken at 32F. At 0F, you are in the 320A range if you’re lucky and should count your blessings if you manage to even get the starter to click; it sure as hell won’t crank over, especially not with molasses in the oil pan. If you have something with 825CCA@32F then you’re still in the 500+ range at 0F and thus can avoid needing a jumpstart (which is hard to get if you live in the middle of the woods with no nearby neighbors).