Well in the manual it specifies oil with API spec SF or SG. Most regular motor oil does not meet that spec, I checked several brands and weights while at napa. The only synthetic they had was amsoil, which I did not want to pay $9 /quart for so I opted for the valvolene stuff they had for bikes which meets that specification at a steal of a price for $7.50/ quart. Looks like I'm going to have to change the oil in my honda motorcycle too...
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99 foreman 450 s.
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