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  • I recently changed my motor oil, using Shell Rotella T 15W-40 instead of Yamaha lube. Initially I put in about a half quart too much, accidentally. When running at normal street speeds, the engine appears to pull (or sound) a little rough, probably due to increased pressure caused by the slight oil overfill. The engine also seemed to run a little rough at highway speeds in 4th and 5th gears (60 to 80 mph). So I removed about 1/2 quart of oil. Now the dip stick reads half way between the upper and lower marks. Since removing the 1/2 quart of oil, the bike runs exceptionally well at street speeds, but still a little rough at highway speeds. However I do plan to add oil to the reccommended level indicated on the dip stick. I just thought I'd mentioned this little experience to express how sensitive my engine runs depending on slight changes in oil levels, and possibly types of oil.
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