I think you can use API grade SF or SF/CC but that's for an '85 i don't know whats changed
Yes. sm is better and newer than sf or sg.
10w-40 conventional api sf or sa
SAE 10W-40, API SF or SG
SAE 10w-40 API SF or SG oil. I would recommend you use synthetic.
A 10w40 oil with an American Petroleum Institute or API rating of SF or SG.
In winter I use 10w40 SF or greater, summer 10w40 or 20w50 SF or greater.
The recommended type of oil to use for a Kawasaki 610 Mule is API SF. Th610 Mule will hold approximately 1.5 quarts of oil.
_ API Certification Mark *2 _ API grade SL or SM, Energy Conserving *2 _ ILSAC grade GF-3 and GF-4 *2
Manual Recommended lubricants for Engine/Transmission are: Type: API grade SE or SF multigrade oil, Viscosity: 40-degrees F(5-degrees C) or above:20W40 or 10-degrees F(-10-degrees C) or below:10W30
Motor oil is rated many ways. One is the API rating for gasoline motors. SJ is better than SH, SH is better than SG, SG is better than SF. etc. So as long as the letter comes later in the alphabet it is ok. However the most modern oils ( e.g. SM) are not suitable for old engines.
Use API Certified SAE 5W-20 Engine Oil