Inspections within the funding period

Hello, have a new car Mitsubishi Colt financed in April. During the duration ( 3 years ) the Fz must be “checkheftgepflegt”. A look at the general price list of my dealer has let me freeze the blood in the veins: 85 EUR the working hour. In addition, the cheekiness of 20 EUR/litre engine oil. Question: Am I obliged to have the inspections done at my dealer, or can I go where I want to?