Kvas12,

Before you do anything else, replace the main shaft and see where you stand, before thinking it is a 4 in 1 problem..

As far as the oiling / lubing parts, I use a light oil I got from my Local Hobby Shop, 3 bucks, but it should last a life time.. Comes with a syringe type applicator.

I oil everything that moves, swash plate bearing, blade grip bearing, main shaft gear, etc. Don't soak it, just a tiny drop. Makes a difference, you'll notice right away how much smoother and quieter things are. When replacing the main shaft and gear, make sure that the teeth of the motor and the main shaft aren't to loose or to tight a fit. When rotating the main blades by hand, it should rotate freely and smooth.

Hope this helps,

Choppersrule