Good idea....well worth a try...
In cold, damp England I've developed a "concoction"/mixture of my own similar to Fred/Eds(?) "Red" Bore Cleaner
http://www.targettalk.org/viewtopic.php?p=68615
but includes a MIL spec gas turbine inhibiting oil/fuel (I used to be in the aviation business and acquired "a quantity" surplus to requirements).
Seems to work OK on my Luger and Lahti etc and they live in the NRA Armoury at Bisley and only get visited once a month. So far, so good - no signs of corrosion and after a quick "rod thru the bore" are ready to shoot.
There are some other Heritage Pistol holders at Bisley who use US made special blue plastic bags for long term storage - but it would be very disappointing to get your P '08 out of it's blue bag and find it rusty.
BTW - what's the minimum temperature you shoot at in Norway? or do you always shoot on indoor ranges?
I was shooting at -2 deg C last Sunday Feb 4th and both the Luger and the Lahti worked well on factory ammo but the Lahti would cycle on a softer home load than the Luger.
BR DCCUK