Wow!!! I've never seen a filter that would not
come off. I've seen them on so tight that the
motor flexes at the mounts just before they
break free.

It might be a good idea to have them
check the nipple which the filter screws on for
any damage when the Dealer gets it off. Sounds
like it may be an air chizel job on the filter
for him.

Let us know of the outcome,

Gary