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I have a 2005 100 inch and the book that came with the motor says "20w50 motorcycle oil" and to use non-synthetic for the first 2000 miles to ensure that everything seats properly. Change every 3500 miles after break-in. I have been thinking of going synthetic now that I have over 5000 miles and live where it gets way hot.

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12y ago

What else can I help you with?