Wow, someone from Suomi here
Terve! Missä oot kotoisin?
I do change my oil once a year (used to be pretty much 15'km or 10'mi), now only doing half as many a year since I live only 2 miles from work and used to have a lot more previously with my old car (but regardless only using good oils, nothing thicker than 5w-xx)
My finnish Golf ran 380.363km and the engine was still doing well when I scrapped it after moving to the UK
Other than that pretty much stick to schedule, i.e. brake fluid every 2 years, coolant 2 years (although due to thermostat housing leak and water pump change every 6 months on avg on my last car, reused some coolant though - as still clear).
Sparks I would only change every 30'km... unless only city driving and electrodes are burnt down or thick covered in soot so it wouldnt burn off.
Air filter makes sense to swap every year as well.