Working on my 10hr service...the manual says to put a new o-ring on the oil filter cover? Everyone doing this or just re- using it? I could understand after half a dozen oil changes, but every time? I had the same basic setup on my 4 stroke dirt bike, but always re-used the oring. I bought the OEM filter, and one would think that if the oring needed replaced every time it would come with the filter. Not complaining about buying a new o- ring, just in the middle of the process and don't want to run back to the dealer if it isn't necessary...thanks