I have a 2014 Summit X with 1600kms, TSS can and I use BRP oil. On my last trip to revy I noticed every time I would take off that there would be black rings in the snow?? My sled has never done this in the past that I noticed and my buddy is riding a 2013 Summit SP (2400kms, MBRP can and BRP oil) and his is not doing this. Is there any other E-tec out there doing this? Should I be concerned? I hate taking it to the dealer as it's usually a completed waste of time and money.