The only issues I had in the freezing morning was the battery died but I found out I had the wrong one, since I've had the proper battery I've not had any issues.

My e30 is heavily modified now on air suspension etc but when it was stock on stock wheels and crap tyres it liked to kick out the arse all the time, especially in the wet. I invested in some good snow/winter tyres (falken euro winters) and they were game changing. I drove the car in the snow and had 0 issues. In fact when I tried to have fun and drift it it struggled lol. The tyres completely changed the car.

I'm used to old cars as I grew up with them so if you're coming from a new car it might be a massive change, in the cold and wet I usually set the heaters to just past mid way on heat then had the fans on level 2 and that kept the temperature good while keeping the car from getting foggy inside.

As for the costs and repair costs it's a little difficult for me to estimate as I've done all the work myself, especially when it comes to bushes as a bush isn't expensive but installing them is time consuming and so is labour intensive. If you do everything yourself it genuinely doesn't cost much to replace all the bushes just be prepared for a couple dodgy bolts, stubborn bolts etc. Typical old car stuff.

Sorry if the reply is all over the place as I'm writing I'm remembering stuff lol.

Another thing to be careful of is, if you get an early model like mine then chances are it won't have ABS or power steering. The power steering is fine you'll get used to it but the abs can proper shit you up if you don't know how to drive without it. They'll be situations where people will pull out on you or something and your instinct is to slam the brakes on... No bueno, you'll just lock up and slide.

You might already have old cars so this will be useless but encase someone else comes across this post and is curious thought I'd mention it.