I fill it 300cl today, like 4l last week. It's way to much oil.. I check coolid every day. It's minus 20 outside, I don't wanna be broken on the road. I wonder how much it can cost to fix leaking.

Depends on the engine temperature and how much coolant is actually left. If the temperature quickly rises above 90 degrees or there is only half of the fluid left, you should not continue driving.

Cooler liquid is leaking, seems in oil system. Can I drive a car or should I immidustly leave to service?

gey check my 2021 list and thumb up if you like it : [link]

I still hate that shit and always will hate,

Little bit, it was shitole

BE - do you remember living under the Soviet Union?