No restrictions on entry to Finland on right-hand drive vehicles no: much more important is its serviceability (it can be checked very carefully !!!) and the availability of all necessary documents.

As for cars with right-hand drive, in Europe - and in Finland in particular - right-hand drive. This is due to the fact that, for example, when delivering mail in rural areas it is much more convenient to get out on the road to open a van, from the side of the road. Or just throw mail through the window to the lawn - just like in the cinema.