The 3 GT is an extended version of the 3 Series range, measuring 20cm longer and 8cm taller than the 3 Series Touring. These dimensions translate to enhanced rear passenger legroom, a slightly larger boot (despite the sloping roofline), and a marginally elevated driving position. 

However, the 3 GT’s appeal isn’t just about being bigger. It’s the clever use of that extra space that makes it stand out. The rear seats fold flat with the flick of a lever in the boot and also recline for added passenger comfort. The rear cabin feels significantly roomier than a standard 3 Series, making it a practical choice for families with older children or those who frequently transport adults.  

On the downside, the 3 GT isn’t as engaging to drive as the regular 3 Series. Even with optional adaptive dampers—which let you adjust the stiffness of the shock absorbers—the 3 GT exhibits more body roll in corners due to its higher centre of gravity and feels less agile during quick directional changes. 

At higher speeds, the adaptive dampers in comfort mode deliver an impressive ride. However, road noise over coarse surfaces is noticeable regardless of the driving mode, and wind noise from the door mirrors can be intrusive on motorways. Around town, speed bumps and potholes can thump into the cabin. Cars without adaptive dampers may feel too firm, and the ride becomes even harsher with M Sport suspension.  

Equipment, options, and extras

The standard SE trim of the 3 GT comes well-equipped with 18-inch alloy wheels, dual-zone climate control, cruise control, Bluetooth, a USB port, rear parking sensors, and a 6.5-inch color screen with an iDrive controller. In mid-2016, the SE specification was upgraded to include LED headlights and tail lights, sat nav, and DAB radio, making it an even better value for money. This is why SE is our recommended trim.  

The Sport trim enhances the interior with sports front seats, ambient lighting, and additional chrome and gloss black detailing. Modern focuses on styling, while Luxury adds more chrome to the exterior and upgrades the interior with wood and leather. M Sport, on the other hand, features unique 18-inch ‘M Star’ alloy wheels, exclusive M Sport interior touches, and M Sport suspension for a sportier feel.  

For engine options, the 320i is ideal if you don’t drive many miles or stick mainly to urban areas, as it’s more than capable of handling the 3 GT’s needs. However, the 320d is the best all-around choice, offering a smooth, efficient, and surprisingly quick driving experience. For those seeking ultimate refinement, the six-cylinder 330d is a compelling option, though its high price tag can be hard to justify.

Costs, insurance groups, mpg and CO2

Compared to the standard 3 Series, the 3 GT offers a slightly different range of engines, emphasizing its premium positioning. Diesel engines dominate the lineup, with the versatile 320d being a top choice, balancing performance, efficiency, and affordability. For those prioritizing economy, the 318d is incredibly cost-effective, while the six-cylinder 330d and 335d excel as smooth and powerful long-distance cruisers.  

If your mileage is low, petrol engines are worth considering. The base 320i is available with rear-wheel or all-wheel drive and provides a solid entry point, while the 335i and 340i deliver impressive speed and performance.  

The xDrive all-wheel-drive system is an option for the 320d, 330d, and 320i, and it’s standard on the 335d. While xDrive models tend to have slightly lower fuel economy, the trade-off is worth it if you live in rural areas with frequent snow or challenging conditions.  

Petrol engines aren’t as fuel-efficient as diesels but use turbocharging to enhance performance while keeping engine sizes small. The range starts with the 320i, offering 45.6mpg and £150 annual tax in rear-wheel-drive form, or 40.4mpg and £190 with xDrive. The 328i offers more power, achieving 42.2mpg and £190 tax. Post-2016 facelift, the 330i joined the lineup, delivering better fuel economy than even the base petrol model, with 47.1mpg and £135 tax.

The Car Planet verdict

Larger and offering more seating flexibility than the standard model, the BMW 3 Series GT presents an intriguing alternative to an SUV. Find yours today at Car Planet!

Car Planet are experts in used cars in Watford and Hertfordshire. Our virtual viewings mean you can check out a car from the comfort of your own home, or you can come in and view our cars in person. Every car goes through a thorough 150-point check to ensure it’s totally roadworthy. We’re transparent, too: we always display the details of a car’s imperfections. We care about sustainability, which is why we plant a tree for every car we sell, and we provide a 7-day money-back guarantee to any customer who isn’t absolutely satisfied with our service. With our competitive finance deals and part exchanges, you’re sure to find what you need, so check out our selection of secondhand 3 Series Gran Turismos today and let’s get the ball rolling!