If I remember right the 2010 800 CFI update bulletin says to run one OIL tank full of Polaris Blue semi-synth through the sled after the update too. In addition to premixing the first tank. My dealer said that is a good idea if you pull out the "gold" oil in the oil tank and fill it with blue (about .7 gal), then refill with gold when that is mostly gone. Since I had the tool to do it, I replaced the gold with blue. Still running it. About 100 miles on the update, no worries so far, runs great (but snow conditions here being what they are, no real load testing yet).