semi synthetic and full synthetic available.
i use their oils exclusively since they support our race effort. a noted engine tuner about crapped himself when he found out that i have 7000 race miles on the RS250 crankshaft, when they're normally only good for 3000. asked what oil "maxima injector" and he said "don't change ANYthing you're doing!"
a lot of WSMC racers use their 0w10 "ultra" and 10w30 "extra" synthetic oils. i run the "extra" in all the 4 strokes in this house... m900, mh900, m900ie, ford ranger, ford e150...