Motorcycles grow more powerful with each passing year, with engines like Indian's Power Plus 108 and Harley-Davidson's new 2.1-liter Screaming Eagle IV V-twin putting out 122 and 130 horsepower, ...

Oil is an essential part of any combustion engine — including motorcycles — and it needs to be changed out regularly to keep everything running smoothly. But there are so many types of oil to choose ...