As most of you know, I'm currently going through transmission problems with my DRZE. While I was at the shop yesterday, I decided to get the mechanic's view on oils. He builds alot of engines, from racing 2&4 strokes to utility fourwheelers. His views towards oils where as follows: Fist off he said he will always recommend a "bike specific" oil. No matter what brand, as long as it is made for a bike. He personally prefers conventional oils over synthetics. He said that's just his opinion, no physical proof of the conv. oils being any better. But, he also said that from a "wear" standpoint, he hasn't seen any benifits of synthetic oils. He said "synthetic oils are for people who want to stretch mileage between oil changes." He also said, that he would trade out frequency of changes for quality of oil. He said he will let some of his racers run a $2.99/qt. oil if they will change it after every moto, before he will let them run a $10.99/qt. oil if they are only going to change it every 10 hours. He said the main difference in "bike" oils and "car" oils is that a "bike" oil is designed to handle the contaminents of the wet clutch and still provide lubrication for the top end. He said any oil will provide ample lubrication for the tranny gears themselves. He said one of the main determining factors of picking an oil is how that oil affects clutch feel. One note though: He also said that there is no way oil contributed to my transmission failure. He also was impressed with the condition of the top end of my bike. I have always ran Mobil 1 15w50 with X1R. I'm not trying to start another "oil debate". I just thought I would throw this information out there. Take it however you like.