How hard does the car have to be driven to keep the engine/exhaust healthy? I have a 2019 diesel Ghibli, 55,000 miles, (which I love). The Eening Management light came on in October followed soon after by the restricted speed setting. Main dealer changed oil and filter and blamed short journeys. Now light has come on again. How hard and how often does it need to be thrashed? Still love the **** car.