Hey all,

the maximum time for a foreigner to drive a foreign registered vehicle in the EU is 6 months.

This is from the finnish cumstoms website:
A traveller who resides outside the EU is allowed to bring a means of transport to the customs territory of the EU without paying customs duty or value added tax. A boat can remain under the temporary admission procedure for at most 18 months, and for example cars, snow mobiles and buggies for at most six months.

This is from the german customs website:
If you are normally resident outside the EU, you may import your non-EU registered vehicle under relief and use it in Germany. This is laid down in customs provisions and vehicle taxation legislation. The period during which the vehicle may be used is limited to six months.

This is from britisch government website:
Temporary imports
You can usually use a vehicle with foreign number plates without registering or taxing it in the UK if all of the following apply:

you’re visiting and do not plan to live here
the vehicle is registered and taxed in its home country
you only use the vehicle for up to 6 months in total - this can be a single visit, or several shorter visits over 12 months.

This is from the dutch customs website:
Do you not live in the Netherlands? And are you traveling into the Netherlands with a car, motorcycle, trailer or caravan with a valid registration number of the country where you live? Then you do not have to report to Customs. You can use this car, motorcycle, trailer or caravan in the Netherlands for 6 months without having to pay taxes.

I think all European countries have the same rule.