Charon
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The reason you probably never heard of Shell Rotella is that it is marketed as an oil for Diesel use. It also has the JASO ratings, so is quite suitable for motorcycle use. Rotella 15W-40 is a conventional oil, often referred to as "dino oil". Rotella 5W-40 synthetic is often called "RotSyn." Unless you plan to do a lot of cold-weather riding, the 15W-40 will meet your needs.
As far as is known, no 10W-40 oil is "energy conserving." That means there are no low-friction additives such as graphite or molybdenum disulphide, so they shouldn't cause problems with the clutch (which runs in the oil). You can buy your oil by price at Walmart, should you choose, and most likely never have an oil-related problem. If your bike is still under warranty, you might feel better buying the Suzuki oil from your dealership for that first change. It won't perform any better, but it might make your dealer a little happier in case you need warranty work.
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