The HiSun 800 and 1000 engines are a V-Twin and the Primary Clutch is bolted directly to the crankshaft and do not have a oiled Wet Clutch ! MA or MA-2 Oil is not needed. 10w40 is a good cool weather oil, 20w50 for hot weather. Synthetic Oil is a stronger oil. Full, Partial or no Synthetic is approved for these engines.