I am quickly racking up miles on my new Duke and getting ready for the first 600 mile service. I wanted to change the oil myself, but I am having difficulty sourcing the oil filter. I can find the filter on Amazon and several other vendors, but it says it doesnt come with an O-ring. I also found the oil filter kit, which was about $60 and that didn't seem right. Anyone in the US ordering their own filters or are you guys just going through the dealer?