If your Nitro piston is properly lubed, you shouldn't need anything in the spring chamber. Chamber oil goes in through the transfer port so that it sits ahead of the seal. No oil should go into the spring area, be it wound wire or gas piston.
I have been searching around for the composition of spring oil and was amazed at how many sites are still promoting it. Of course, many of these are blogs hosted by retailers who just happen to sell the stuff. And it seems more than a few are simply repeating the information given by one or two sites. It will be interesting to see the financial connections between the blogs and retailers, as revealed by the new legislation that is due to come out shortly. Some of these bloggers, such as PA's, should know better than to still refer owners to this old stuff.


I think I've discovered their inspiration:
