So i have 2 chainsaws and one of them is like 6 years old,i got it from my grandpa because he just got a new one and i want to make it run as long as i can so......some tips or tricks to make a chainsaw last as long as possible.Like anything,anything from cleaning the airfilter to even reaplacing some parts.Please tell as much things as you know.I dont wanna wreck any of my chainsaws.