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I know this has been covered many time but I found it a very intresting read none the less. Since Yamalube was one of the oils tested I thought you guys might be intrested. For those who don't want to read it all scroll down to the summary at the bottom.
http://www.hdforums.com/files/Motorcycle-Oil-White-Paper_g2156.pdf
http://www.hdforums.com/files/Motorcycle-Oil-White-Paper_g2156.pdf