Ok I've had the same bar oil leak since I bought this 455 almost 9 months ago. I lost an entire tank of bar oil over the last 4 months of non use.
I removed the bar, handle, etc. to find on the bottom of the saw. It was leaking from the pickup that plugs into the tank, as previously
described. I cleaned it all up , use the halomar to seal it, and re-filled the tank. So far its has held. I have not run the saw yet, but in
my case this is definitely the leak.
On another note Husqvarna has a support line.. what a joke. Took 5 calls and the person on the other end of the phone could
only direct me to the local repair shop. I happen to know these guys. They have been sending things to other shops that they can't fix.
I'm sure this is the last Husqvarna I will ever own... Obviously soem business capitalist got a hold of this company, and the product quality has gone to (H l).
Good luck with your leaks...
Eric