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The 5 weight would be to light of an oil for a air cold engine. I have used Mobil-1 10-40 motorcycle oil with no bad results in the winter. But would go to 20-50 Mobil-1 in the summers. But that was years ago when my closes Victory dealer was 350 miles away. There are several companies now that make 20-40 motorcycle oils. Do a search on here on oils. You will find all kinds of opinions and oils on it.
 

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