Some gassers are more sensitive to oil viscosity than others. My 5 gassers were all different. I use Shell Rotella and some of my gassers (99,01, & 02) were fine with the thicker non-synthetic, my 2011 likes the thinner semi-synthetic, and my 07 required the full synthetic which is thinnest of all the Rotella oils. All the bikes were fine with any of them for a couple of rides but you get more rides without noticeable drag when using the thinner oil.
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