Adjustment of maintenance intervals XC70

Dear Volvo friends, my XC70 is now six years old and has reached 100,000 km. Until now, the vehicle has been serviced once a year by Volvo. The mileage is currently about 20,000 km per year. If I see it correctly, it is no longer possible to expect Volvo’s flimsyness in the event of major damage (e.g. on the engine, on the automatic transmission, on control units) for my vehicle. Thus, my workshop for the control unit of the radar module me In the last year Volvo Germany answered negatively and I was allowed to pay a good 1300 euros myself. I now want to change the maintenance intervals as follows: The vehicle should be maintained every 30,000 km at Volvo in the future. This means that the Volvo inspections would then be carried out every 18 months. The Volvo mobility guarantee would then be omitted. Instead, I have a protective letter of my car insurance. In addition, I would then myself every 15,000 km an oil This would give the vehicle all 15Tkm of new engine oil, which is certainly not harmful, because I have the intention to drive the car for a long time. What do you think of this idea? Greetings from Mittelhessen!