Can anyone please tell me how to drain blower oil on 525sc and the best oil to use? thanks

I use a 60cc syringe with a piece of rubber hose attached. Just remove the plug and suck it out.
Eddie

I bought one of those battery filler bulbs and use that. Lube is red line shock proof.

That is exactly what I used to drain mine also.

You can't get 100% of the lube out, but it gets most of it and its fast and easy. Make sure to drain/change both the front and back lube. They are separate.