I had a 2000, 200cc MXC and bought a 2003, 200cc MXC this past Sept. My son races a SX 125. We both run hare scrambles. We have tried several different brands of oil and have settled on the Maxima MTL Fluid, 2-cycle transmission lube, ClutchSaver Formula. We use the Maxima Formula K2 Racing 2-cycle, High RPM Racing Rormula premix. Log onto www.Maxima.com for detailed info on these products. Motorex oils are great too but sometime hard to get.