Using 15W/40 diesel oil in motorcycles is a very popular fad, because this motor oil works very well.  You might enjoy reading the following articles. 
http://www.calsci.com/motorcycleinfo/Oils1.html
http://www.calsci.com/motorcycleinfo/Consumables.html
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
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