UPDATE: Went out and bought a new large and small o ring. Compared the "old" one....(only 100 miles on it,a couple weeks old)....to the new one;the new one was a fractionally smaller than the "old" one....hmmm?.Looked at the old o ring package that I kept and compared the part numbers versus the new one....this is what I noticed!. The part number 93210-54175 was on both packages,but, just below this is says: Made in Inodonesia then another smaller printed part number = F110317A(old package). On the new package the smaller part number read = F051202A?. I wonder if they have had a foul-up as Yamaha did on their oil filters?. Something to think about. The o-ring comparison above is in relation to the large o-ring on the oil filter cover, not the real small one on the filter drain bolt.