Best fuel/oil ratio for a PA50II?

itsahonder /
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I'm using full synthetic oil right now with a approx 27:1 ratio. After using half the fuel with a new plug, I checked the plug and it was a brown to dark brown colour. I believe I should be aiming for a caramel colour right? How high is too high for the ratio? At 40:1, do I run the risk of seizing? Appreciate the feedback!

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