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Mercedes-Benz Gls 450 d Mild-Hybrid (2023–present)

The Mercedes-Benz GLS 450d represents the pinnacle of German luxury SUV engineering with mild-hybrid technology. Powered by a 3.0L inline-six diesel with integrated 48V electrical system, it delivers 700Nm of torque while reducing fuel consumption. Most NZ examples will be high-spec imports, typically landing with 40,000-80,000 km from Japanese or European markets. CARFIX stocks critical maintenance components for these sophisticated vehicles.

Parts for the Mercedes-Benz Gls 450 d Mild-Hybrid

Known issues

48V mild-hybrid system electrical faults (battery health sensor issues), diesel particulate filter regeneration challenges in urban driving, electronic air suspension compressor wear, coolant system sensor failures, integrated starter-generator (ISG) bearing wear, diesel injector carbon buildup, transmission mechatronic unit wear, electronic parking brake module failures, adaptive LED headlight calibration drift, complex MBUX infotainment system software glitches.

WOF tips

Adaptive suspension must maintain correct ride height. Electronic stability control and ABS systems must be fully functional. Adaptive LED headlights require precise aim calibration. Tyre pressure monitoring system must work without errors. All driver assistance sensors (radar, cameras) must be clean and aligned. No warning lights permitted, including mild-hybrid system diagnostics. Exhaust emissions system must pass strict diesel particulate filter regulations.

About the Mercedes-Benz Gls 450 d Mild-Hybrid

<p>The GLS 450d uses Mercedes' OM656 diesel engine coupled with an integrated 48V mild-hybrid system. The electric motor provides up to 15kW of supplementary power and enables advanced start-stop functionality. Unlike full hybrid systems, this setup focuses on efficiency and smooth power delivery rather than pure electric driving.</p><p><strong>Powertrain Details:</strong> 3.0L inline-six diesel, 210kW (282hp), 700Nm torque. 48V mild-hybrid system with integrated starter-generator. 9-speed 9G-TRONIC automatic transmission. Permanent all-wheel drive (4MATIC) standard. Fuel consumption: 7.2-8.0L/100km claimed, expect 9-11L in real-world NZ conditions.</p><p><strong>Chassis & Suspension:</strong> Adaptive air suspension standard. AIRMATIC system allows ride height adjustment between Comfort and Sport modes. Front double-wishbone, rear multi-link suspension. Brake-by-wire system integrates regenerative braking with the 48V mild-hybrid setup. Electronic damping adjusts in milliseconds based on road conditions.</p><p><strong>Advanced Systems:</strong> MBUX infotainment with augmented reality navigation. Multiple driver assistance packages available. Integrated 48V electrical system powers electronic systems more efficiently than traditional 12V setups. Allows for advanced electrical load management and reduced alternator drag.</p><p><strong>NZ Ownership Considerations:</strong> These vehicles require specialist servicing. Oil changes use MB 229.61 specification synthetic oil, interval every 15,000km or annually. Diesel particulate filter (DPF) requires regular long-highway runs to regenerate. Coolant system uses MB 325.5 specification fluid. Transmission fluid is 'lifetime' but CARFIX recommends change at 100,000km.</p>

Questions owners ask

What kind of engine does the 2023+ Mercedes-Benz GLS 450d have, and what's its fuel economy like in New Zealand?
The GLS 450d is equipped with a 3.0L inline-six diesel engine (OM656) paired with a 48V mild-hybrid system. While Mercedes claims 7.2-8.0L/100km, expect real-world fuel consumption in New Zealand to be around 9-11L/100km due to driving conditions.
Does the Mercedes-Benz GLS 450d 2023+ have any common problems I should be aware of?
Yes, some common issues to watch out for include potential electrical faults in the 48V mild-hybrid system, challenges with diesel particulate filter (DPF) regeneration (especially with lots of city driving), wear on the electronic air suspension compressor, and occasional software glitches in the MBUX infotainment system.
What kind of servicing does my 2023+ Mercedes-Benz GLS 450d require in New Zealand?
The GLS 450d requires specialist servicing. Oil changes should be performed every 15,000km or annually using MB 229.61 specification synthetic oil. Although the transmission fluid is considered 'lifetime', CARFIX recommends changing it at 100,000km. The coolant system requires MB 325.5 specification fluid. Also, ensure you take your GLS on regular long highway drives to allow the diesel particulate filter (DPF) to regenerate properly.
What should I check on my 2023+ Mercedes-Benz GLS 450d to pass a WOF in NZ?
For a Warrant of Fitness, ensure the adaptive suspension maintains the correct ride height. The electronic stability control and ABS systems must be fully functional. Adaptive LED headlights need precise aim calibration. The tyre pressure monitoring system must work without errors. All driver assistance sensors (radar, cameras) must be clean and aligned. There can be no warning lights, including those related to the mild-hybrid system. The exhaust emissions system must pass strict diesel particulate filter regulations.
Where can I get an oil filter for my 2023+ Mercedes-Benz GLS 450d in NZ?
CARFIX stocks 27 SKUs for the Mercedes-Benz GLS 2023+, including the correct oil filter for your 3.0L diesel engine. You can find it in our OIL FILTER category.
How often should I change the transmission fluid on my Mercedes-Benz GLS 450d 2023+?
While Mercedes-Benz considers the 9G-TRONIC transmission fluid 'lifetime', CARFIX recommends changing it at 100,000km to ensure optimal performance and longevity of the transmission.
What type of coolant does my 2023+ Mercedes-Benz GLS 450d require?
The coolant system in your GLS 450d requires MB 325.5 specification fluid. Using the correct coolant is crucial for preventing corrosion and maintaining optimal engine temperature.