Car Maintenance , Connecting Customers with Experts – all in German Experts Mobile App. Loyalty Program Loyalty program is where you can view your current loyalty points, rewards and redeem information at a glance. Just log in to the app using a mobile number registered with German Experts Car Maintenance and your loyalty points details will be fetched automatically. Book An Appointment. Easily book a service appointment by selecting a suitable date, time and preferred branch location. Bra