Hey all, So I'm tackling the oil leaks on my old beast. Here's one I can't seem to get no matter what I try. Here's what it looks like after about 1000 km or running after cleaning it up. And full sized image if anyone wants to look: http://stewie.smugmug.com/Other/Mobile-photos/i-hvLsM7k/1/X3/2012-05-14-093823-X3.jpg I've used new crush washers, and tightened it down as far as I feel comfortable, i.e. I don't want to strip it. I'm about to either make a cork washer or find an O-ring that will fit over the fill plug. I never have oil laying there, or dripping. It's just enough to gather the dirt and dust and I know it's there. Any suggestions?