Mazda 6 (GJ)

The third-generation Mazda 6 (GJ), launched in 2012, was a game-changer for the brand, introducing the "Kodo" design language and "Skyactiv" technology to the large family car segment. Positioned as a stylish and engaging alternative to the Volkswagen Passat and Ford Mondeo, it combined a premium-feeling interior with a chassis that prioritized driving dynamics and lightweight efficiency. In the UK, it has been a favorite for both executive commuters and families who value sharp handling and a level of aesthetic flair that few rivals can match. However, the reliability record of the early GJ-generation models is deeply divided by engine choice. While the naturally aspirated 2.0-litre Skyactiv-G petrol engine is exceptionally robust and dependable, the 2.2-litre Skyactiv-D diesel engine is known for significant risks. Early diesels are prone to oil dilution (where fuel mixes with the engine oil) and carbon buildup in the intake manifold, which can lead to turbocharger failure or catastrophic engine damage if the oil level is not monitored closely. Other common issues include failing power-folding mirror motors and thin paint that is easily chipped by UK road debris. When buying a used GJ Mazda 6 in the UK, the 2.0-litre petrol manual is widely considered the safest and most reliable used choice. Prospective owners of diesel models should verify that the oil has been changed strictly every 10,000 miles and check the dipstick for any signs of an "over-filled" oil level, which indicates dilution. It is also important to test the infotainment system for responsiveness and to check the condition of the alloy wheels, as Mazda's larger wheels from this era were prone to "white worm" corrosion under the lacquer. A well-maintained Mazda 6 remains one of the most rewarding and visually appealing cars in its class.