Decided to change the oil and filter today even tho I was told she had been serviced when I bought her in November. I thought the engine and clutch felt and sounded a little rough to what I was expecting from a much newer bike to my old one and the oil was a manky colour too. Well she now runs Castrol power 1 with a k&n filter and sounds and feels sweet. I can't fault this oil and filter combo, it was all I used on my old TL and that never missed a beat. Happy chappy!!