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Mercedes-Benz GL: X164 and X166 generations, engines and trims
Mercedes-Benz GL — a large, luxurious seven-seater SUV, produced from 2006 to 2015. We look at two generations (X164 and X166), the most popular engines, trims and what to check when buying a used GL.
GL in brief
The GL was the largest Mercedes-Benz SUV until the arrival of the GLS. Standardly offered with seven seats in three rows, 4MATIC all-wheel drive and an automatic 7-speed transmission 7G-TRONIC.
It's a spacious and comfortable car for long journeys, towing and large families. Unlike compact SUVs, the GL is very large, heavy and more expensive to run.
Which generation to choose
The first generation X164 (2006–2012) has a boxy, robust body. Its interior is older but spacious, and for a long-term buyer, the most important thing is the technical condition. Around 2009, the model was refreshed.
The second generation X166 (2012–2015) received a more modern design, new engines and more safety and comfort features. It got newer engines, so it's often considered a better choice if the budget allows.
Engines and transmissions
The most common diesel engine is the 3.0-litre V6 (GL 320 / 350 CDI and later 350 BlueTEC, around 220–260 hp). Previously, a 4.0-litre V8 diesel was also offered (GL 420 CDI, around 306 hp).
Petrol V8s: GL 450 (around 340 hp), GL 500 (around 390 hp initially, later around 435 hp with twin turbos) and the sporty GL 63 AMG. All cars come with the 7G-TRONIC automatic gearbox and 4MATIC all-wheel drive.
What to check when buying a used GL
Most GLs have the AIRMATIC air suspension. Check if the car sits level, if there's no air leakage, and if the compressor isn't running constantly. Suspension repairs can be expensive.
For diesel V6s, check the exhaust system valves and the particulate filter. Test the gearbox, 4MATIC system, and brakes, and inspect the underbody for corrosion.
Electronics and a host of comfort features are additional potential failure points, so test the seats, windows, electric tailgate, and infotainment. A full service history is crucial.
Trim levels
Names and equipment vary by market and year; we list the most common trims found in Europe.
GL 320 / 350 CDI
X164 / X166The most popular diesel choice with a 3.0-litre V6.
- 3.0-litre V6 diesel engine
- 7G-TRONIC gearbox and 4MATIC system
- Often comes with AIRMATIC suspension and a leather interior
GL 420 CDI
X164Diesel V8 with more power.
- 4.0-litre V8 diesel engine
- More power than a V6
- Often comes with a full suite of comfort features
GL 450 / GL 500
X164 / X166Representatives of the V8 petrol engine family.
- 4.7 or 5.5-litre V8 petrol engines
- Quick acceleration, high running costs
- Often comes with luxurious trim
GL 63 AMG
X164 / X166The most powerful and expensive version.
- Sporty AMG V8 engine
- AMG body and interior details
- Often comes with sporty suspension and brakes
Comparison of trims
| GL 350 CDI / BlueTEC | GL 420 CDI | GL 450 / 500 | GL 63 AMG | |
|---|---|---|---|---|
| Who it's for | For daily driving and long journeys | For those who love a powerful diesel | For those who love a V8 petrol | For driving enthusiasts |
| Engine | 3.0 l V6 diesel | 4.0 l V8 diesel | V8 petrol | V8 AMG |
| Fuel consumption | Lowest | Average | High | Highest |
| Price in the used market (relatively) | €€ | €€ | €€ | €€€ |
For most buyers, the GL 350 CDI or BlueTEC is the best bet, as it's the most economical. The petrol V8 or AMG is only worth considering if you're prepared for high fuel and maintenance costs.
Pros
- A spacious seven-seater interior
- Comfortable and quiet ride
- Strong towing capability
- Luxurious features and prestige
Cons
- High fuel consumption
- Expensive maintenance and AIRMATIC suspension repairs
- Huge size, tricky to park
Frequently asked questions
What's the difference between GL X164 and X166?
The X166 is the newer generation with a modern design, updated interior layout, and more efficient engines. The X164 is cheaper but often has higher mileage and more wear and tear.
Is the GL suitable for towing a trailer?
Yes, the GL was designed for towing and has a high maximum towing capacity, but always check the exact value in the specific vehicle's documents.
Why did the GL become the GLS?
From 2015, Mercedes-Benz renamed the SUV range to GLS to align with the naming system of other models. The GLS is the direct successor to the GL.
Updated 2026-10-17 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
