Has anyone tried 10w50 oil in the 90s CB750s (or other I4)? The manual calls for 10w40 or in hot weather 20w50. I used 20w50 last summer, and it ran noticeably smoother in the Texas heat compared to 10w40. However, come fall when the temperature dipped below 60, it got real sluggish and startup was a pain. Seems like 10w50 (or even 15w50) would smooth things out in the heat without as much cool weather sluggishness. Good Idea / Bad Idea?
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