Mercedes GLA X156 (2013 – 2020)

Reliability score : 8.0/10

The Mercedes-Benz GLA (X156) is the brand's first compact luxury crossover, sharing the MFA (Modular Front Architecture) platform with the W176 A-Class. Introduced in 2013 and facelifted in 2017, it bridges the gap between a premium hatchback and a traditional SUV. While it offers a slightly raised ride height and optional 4MATIC all-wheel drive, it drives very much like a standard car. The diesel lineup, which is the primary focus of this review, relies on two distinct architectures: the Renault-sourced 1.5L (OM607) for entry-level efficiency, and the Mercedes-in-house 2.1L (OM651) for higher torque and towing capacity. Overall, the X156 is praised for its styling and fuel economy but criticized for its firm ride, limited rear headroom, and interior material quality that falls slightly sh

✅ Strengths

Excellent fuel economy on diesel models (especially the GLA 180 d)
Attractive, car-like styling that ages well
Strong torque and highway cruising ability of the OM651 (200 d / 220 d)
Available 4MATIC system is highly capable for a compact crossover
High safety ratings and standard collision prevention assist

⚠️ Weaknesses

7G-DCT dual-clutch transmission can be jerky at low speeds
OM651 diesel engine is noisy and unrefined under hard acceleration
Rear timing chain on the OM651 is very expensive to replace if it stretches
Interior material quality and NVH (Noise, Vibration, Harshness) are below standard Mercedes levels
Limited rear passenger headroom and relatively small boot space

🎯 Verdict

The Mercedes-Benz GLA (X156) is a stylish and efficient premium compact crossover, but it requires careful selection. If you are buying a diesel, the OM607 (GLA 180 d) is highly economical and reliable provided the timing belt is changed and it sees highway use. The OM651 (GLA 200 d / 220 d) offers much better performance and 4MATIC availability, but the risk of a costly rear timing chain replacement means you must buy one with impeccable, frequent oil change history. The 7G-DCT gearbox is the weakest link across all models; ensure it has been serviced. Overall, a post-facelift (2017+) GLA 200 d with documented maintenance is the sweet spot for diesel buyers.