We've been through Olderfjord on the E6 twice in our van, once in 2011 and again in 2017, and on neither occasion were we tempted to go up the E69 to Nordkapp.
We were put off by reports of the most expensive undersea tunnel and car park anywhere in Europe and the prospect of hoards of other travellers. Anyway the Nordkapp is not the northernmost point of mainland Europe - it is on an island called Mageroya!
The "real" Nordkapp, that is to say the northernmost point of mainland Europe, is Kingarodden in Nordkynhalvoya. There is no road to there. The nearest settlement is the port of Mehamn which we visited having travelled over two high snowy passes in June 2017. Please see:
Ann and Roger travel