The regulation is quite clear: in any EU country, inspection must happen at least every 2 years for vehicles older than 4 years. I understand that Finland allows a 4 year gap after first registration. After that, the max period is still 2 years. Individual countries may also require 2 years (or less) during the first 4.
The maximum in EU cannot be two years if any EU member state allows more than two years.
The regulation is quite clear: in any EU country, inspection must happen at least every 2 years for vehicles older than 4 years. I understand that Finland allows a 4 year gap after first registration. After that, the max period is still 2 years. Individual countries may also require 2 years (or less) during the first 4.