Welcome, tervetuloa,
You can find lots of information related to aerodynamic modifications here. on Finnish winter its important to block the radiator grill. you can block it fully without any problems.
Also the oils should be as thin as possible and use the block heater if you have one.
One easy mod is to change your tires to narrower and taller.
If you are willing to change the looks of your car then there are more options.
If you need help on your car I can help also in finnish.
Vesa Tiainen
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