How much is an oil change on the Maserati Granturismo?

I was quoted $460 for an oil change on the Maserati Granturismo, but it will probably be $500 I had considered getting a 2 year extended warranty for $4600, but to keep it under that warranty i have to perform the 4th year service, and that includes replacing every filter on the car. Flushing all the fluids, including coolant, brake, power steering, differential, trans fluids, also replacing the drive belts, oxygen sensors, wiper blades, for a cost of $2600. All those services were done on the 2nd year service 3,500 miles ago, so I don&think some are necessary, and I think its best if I don&get extended warranty and just service the car myself.