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Haynes says "API grade SE, SF, or SG ; SAE 10W40, 10W50, 20W40 or 20W50".

I use 10W40 semi-synthetic. I used full synthetic for a while, but it's really overkill.
 

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10 W 40
 

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Currently 5W-40 full synthetic but have used the 10W-40 in the past no problem. Just make sure you use motorcycle oil. Regular car oil isn't designed to be run at 12 rpm and will break down rapidly.
 

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As long as the oil isnt Energy Conserving you can use it but it will shear down quicker.

From what I have read online some people put as a good rule of thumb:
Auto oils (M1 15/50)-1500 miles
Diesel oils (rotella 15/40,mobil delvac)-2000-2500 miles
Syn "motorcycle specific oil" (amsoil, maxima)-3000-5000
all these are dependent on the riding conditions, riding habits
 

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I run Brad Penn 20W50 syn blend in summer, rotella syn 5W40 rest of year
 
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