The manual for my Harley suggests that if it is not possible to obtain the official Harley oil it is better to use a diesel engine oil as it is more suited to an air-cooled engine.
I run all my bikes on diesel engine oil, including the Harley which now has over 60k on it.
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C90's,
Riding one is only slightly more interesting than walking
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If you think you are too small to make a difference you have never spent the night with a mosquito.
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