The newer Polaris engines all use Nicasil cylinder coating designed to last a long time. And use single rings on the pistons.
As I stated earlier, I ran my new 2015 Polaris 800 from day 1 on VES synthetic. It did NOT use one drop of DINO oil. I performed periodic compression and leakdown tests. The engine did take a few hundred miles of trail riding using numerous short bursts of WOT to break the rings in and make decent power. During that time, I raced my sled against many others with great results. I also used a Gtech accelerometer to log performance. I documented all of this in a special thread I started on HCS to help refute some of the false predictions spouted on here like this one.
Additionally, DTR mentioned how to break these newer Polaris engines in in their testing of these engines and showed the gradual increase in power as a result. In my experience, synthetic oil was at least as good as any other oil and in some cases, much better. One of my riding buddies on our first ride had the dealer drain all synthetic oil and replace it with Legend semi-synthetic Oil in his new Pro-S 800. We raced many times and it showed no advantage whatsoever. In fact, my sled was slightly faster. But, he later experienced a severe drop in performance due to other causes and finally sold it. What may have worked in older Polaris engines with cast iron bores and double ring pistons isn't necessarily the answer today.