I recently (yesterday) bought a new to me PWC. The previous owner was using Quick Silver PWC 2 stroke oil. Reading this oil and talking to the local dealer, I don't think this is the correct oil as it is not TC-W3 rated oil. I believe Quick Silver does make a TC-W3 oil and thought about going to this but I see the manual says to use Yamalube 2-W oil. I believe this is the same as the TC-W3 rated oil (within reason). As a result I'm questioning the choice of oil. I hate to change it unless there is a valid reason. What does everyone recommend? Is there a reason I should change it?