I recently bought a new Stihl chain saw after damaging my old one (totally my fault.)I had my old one for 8 years and had no trouble at all. The new has a "toolless" caps on the gas and oil tanks which fold out for easy opening.
On the back side there are "knobs" which fit into 2 grooves if the cap is seated properly. No problem with the gas cap but the oil cap refuses to go into place.
The first time I put oil in it took about 20 minutes to get the cap on.
I am adding oil for the second time. I have spent 30 minutes and cannot get the cap to go into place.
I thought I would use the caps from my old saw but of course they are different sizes.
Review about: Stihl Chainsaw.