I just changed to Shell Rotella-T 5W-40 (synthetic) on my 06. I was reluctant to put oil designed for diesel trucks in my bike, but after doing LOTS of reasearch and from suggestions here on the forum, I decided to try it. It really made a difference for shifting. It used to be clunky when shifting, but seems much smoother now. I really like it. Also, for oil filters, use a Purolator Pure One 14612, or a Mobil 1 M1-110. Way better filters than the Kawi brand. Just changed mine and took about 30 minutes and that includes removing the left lower fairing.
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