After buying a used 40 hpr. direct fuel injection Nissan I have not found anything but quicksilver for this motor (locally) the oil notice on the motor says to never fill with a mixture of this oil with any other oil or gasoline into the oil tank . I assume they are talking about regular two cycle oil and the synthetic direct injection blend .would it be ok to mix quicksilver and Nissan oil ,both being specifically for two cycle low pressure direct injection motors ?