Check fuel/oil ratio when you run it. Adjust accordingly, unless you never plan to own the sled past warranty expiration, if you have one. Shoot for nothing less than 40:1. I run as much oil as possible without fouling plugs or plugging the VES valves routinely. And yes, since the 600 CFI is also included in the EPA emissions stats, they are tuned lean, also. Each sled can be different. Your sled, do what you want. If it's under warranty, a good dealer should support your increasing oil use. After warranty, it's still yours, and any damage is already done.
On the 8, I've run abit less than 100:1 in the tank, 6 ounces of oil every 5 gals of gas, and at least an once per gal. I refill startron bottles with oil and use that to measure if I have to, and it can be carried on the sled. Many rental ops out west add oil to the fuel on the CFIs, even on the 6's, if that means anything to you.