I don't know why Morgan changed the cap. On my 2012, the cap with the dipstick, there is a recess inside and an "O" ring inserted. Seems to be one thing they did right on the first 3 wheelers. I don't see why you can't have the o ring recess machined in to all the newer caps---Mine doesn't leak a drop.
Are these oil caps still around or have they all been swapped out?
Do they fit the later style oil tank?
