Of course polaris would say its an issue, and then blow it off as nothing. Hopefully your friends dealer wasnt dumb enough to think nothing of it and send him riding! If so, thats clearly what could have caused his problem. If a dealer sees whats pictured above, they immediately should know it atleast needs new head gaskets, and probably all new top end gaskets. Without even doing any testing, pulling apart, cleaning and installing new gaskets and seals for this symptom will almost always cure this problem.