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Frequently Asked Questions: New Cars
03 Aug 2026
Buying a new car is a memorable milestone, especially when you’re the very first registered owner. To help make the journey as straightforward and enjoyable as possible, we’ve answered some of the most frequently asked questions about purchasing a brand-new vehicle.
When do new models come out?
Vehicle registration plates change twice a year, in March and September. New car models or facelifts can be released throughout the year at manufacturers’ discretion.
When does a new car need an MOT?
A new car needs its first MOT on the third anniversary of its registration. For example, a 76 Plate vehicle registered in September 2026 will be due its first MOT in September 2029. After this, a car needs an MOT test every year.
Do I need to ‘wear in’ my new car?
Although today's cars are built to exceptionally high standards, a gentle break-in period during the first 1,000 miles is still recommended. Driving smoothly and avoiding excessive strain on the engine can help optimise long-term performance and efficiency. For best results, avoid harsh braking, aggressive gear changes, high-speed driving, and engine speeds above 4,000 rpm during this initial period.
Electric vehicles require no ‘wearing in’ period, they’re good to go!
What is the first thing I should do when I get my new car?
Before setting off in your new car, make sure it is properly taxed and insured, and that the vehicle has been registered in your name. Check that all relevant documentation, including the service book, has been completed and stamped where required. It's also worth taking some time to familiarise yourself with the vehicle's features and controls, from adjusting the seats and mirrors to understanding the dashboard functions and driver-assistance systems. Once you're comfortable behind the wheel, all that's left to do is enjoy the journey in your new car.
Are petrol or diesel cars better?
The best fuel type for you depends on how and where you drive. Diesel vehicles are typically more fuel-efficient than their petrol counterparts and are often well suited to drivers who regularly cover long distances or spend a lot of time on motorways. For predominantly urban driving, shorter journeys or lower annual mileage, a petrol vehicle is often the more practical choice. When deciding between petrol and diesel, it's important to consider factors such as fuel economy, running costs and your typical driving habits.
Should I switch to electric?
Your choice of powertrain should reflect your driving habits, lifestyle and future motoring needs. If you're considering making the switch, an electric or hybrid vehicle could be the ideal solution. The UK's public charging network continues to grow rapidly, with more than 120,000 public EV chargers available across over 46,000 locations, making electric driving more convenient than ever. With an extensive and ever-expanding range of Mercedes-Benz electric models to choose from, it's never been easier to enjoy the benefits of electric motoring.
If you're not quite ready to move away from a combustion engine, a hybrid model can offer the perfect balance between traditional and electric power. Combining the strengths of both technologies, hybrids provide improved efficiency and lower emissions while helping drivers make the transition to fully electric motoring at their own pace.