Don't know about the Kawi engines, but I believe on Kohler engines, such as the Command, they have hydraulic lifters and call for 10w-30 oil whereas on engines such as the Magnums and Courage engines, with solid lifters, they call for 30w oil. I think the multiviscoity oil helps with the hydraulic lifters.
Someone please correct me if I am off the mark with the above.
Thanks!
Bill
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