I changed the oil on my classic recently, just the oil. I had changed it already and I felt the filter still had life in it but I was about to head out from Toronto to PA on a 1000 KM round trip and thought I should put fresh oil in it. Anyway, the morning I was about to head out I noticed a small bit of oil on the left side of the bike towards the kickstand. I wasn't sure if it was oil I had dropped while doing the change or if I had a leak, so I checked the drain bold and was able to give it another turn with the wrench. Now, I don't own a torque wrench, but this isn't the first oil change I have done and I normally do it be 'feel', careful not to over tighten it. Anyway trip went fine...but bike continues to leak oil. I know it's coming form the drain bolt because i propped a paper cup with some paper towels right under it and it is soaking through. I remember my last bike had a 'crusher washer' that you'd replace when doing an oil change, but my Vulcan doesn't have a washer on it - should it? Is it recommended to change the drain bold periodically - or is it just likely that I over tightened or under tightened the thing?