+1 on the VR1, it is fine to use. I am guessing valve seals if it didn't smoke BEFORE sitting for a year. They can harden up just sitting like that. There is no magic bullet. It will smoke until fixed properly.

 

If it's valve seals then even 20-50w won't help, nor any other miracle cure in a bottle. It wasn't until I replaced the seals that it went away. It's not a difficult job to change these, but using the same old umbrella seals will most likely result in smoking again.