1981 Honda CB750F supersport

Joined
Apr 30, 2008
Messages
18
Location
Toledo, OH
Just purchased a 1981 Honda CB750F supersport, and I'm wondering what would be my best choice for oil. The previous owner had it serviced at a shop, and is not sure what grade was used. I don't have a factory manual, but the bike recommends 10w40. Any suggestions?
 
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