My dealer set my 07 225Ho to run on XD 50 which is now in the tank.I Can get a great deal on some XD100--$10 a gallon(pro was given the oil). Can I just add this oil to my tank on the XD50 setting, or does my dealer have to adjust something.- Is there a advantage to running XD100 on the XD50 setting.--Can I go back to XD50 once I've run XD100 in my motor???--- Sorry a lot of questions--I'm an EX Merc guy not used to all of these choices!! (GREAT MOTOR!!!!!)