Just a suggestion, to tease you.
This is a complete tour that can be driven in 5-6 days depending on weather and mode.
1.
http://goo.gl/maps/h4Wkp From road E134 to "B" is a very scenic route and most is routed on high ground with more curves than straights.
2.
http://goo.gl/maps/r2J32 This is one of the most enjoyable stretches in Norway! (Google Maps can however not route further north from "B" therefore you have to go to the next link to continue).
3.
http://goo.gl/maps/7h6VZ (You have to continue from "B" in the previous link to "A" in this link and then continue) This route is also very scenic with twisty roads. At "C" is a very interesting road. Between "D" and "E" is a tunnel, but in reality one would choose to go by road Fv243 which cannot be planned by Google Maps this time of year…
4.
http://goo.gl/maps/CQ8Wm This route is one of my favorites following Tindevegen (Toll road, 80 NOK) to road 55, again Google Maps can only route to "B" therefore you must continue on the next link…
5.
http://goo.gl/maps/ocwPP …and here it is. Again G.M. causes problems. This stretch would actually leave road 15 at the white dot and follow road 258 down to "B" and the north to a white dot and on to road 63 (Next link). Road 258 is also called 100 years road or Old Strynfjell road and it's extremly scenic.
6.
http://goo.gl/maps/q6CED Route over Geiranger towards Trollstigen.
7.
http://goo.gl/maps/A1ifi This stretch should please all gravel road lovers! After leaving E6 the road turns into a gravel road for most parts down to road 33.
8.
http://goo.gl/maps/DLD1v Last leg, Oslo to Gothenburg