Mercedes ML: Which engine is the most reliable? Used car buying guide
The Mercedes ML (W164 then W166), later renamed the GLE, remains a highly sought-after premium SUV on the used car market. Comfortable, powerful, and spacious, it also proves to be an excellent family vehicle.
But some engines or configurations are much more reliable than others. Here's our complete guide to buying an ML without any unpleasant surprises.
Reliability according to the engines
ML 280 CDI / 300 CDI V6 Diesel
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OM642 engine , known for its robustness.
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Generous couple, reasonable maintenance.
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Points to watch out for: oil leak (oil box, cylinder head cover), EGR valve , turbo hoses.
👉 Excellent compromise between reliability and running costs
ML 320 CDI / 350 CDI V6 Diesel
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Same mechanical base as the 280/300 CDI but more powerful .
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Very reliable with a complete service history.
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Point of concern: fouling may occur if driving in urban areas for extended periods.
ML 250 Bluetec 4-cyl Diesel (W166)
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More fuel-efficient.
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Sufficient for everyday use, but less pleasant on a large SUV.
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Decent reliability but injections and turbo need monitoring after 180,000 km.
ML 350 V6 Petrol
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Very soft and quiet.
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Free from diesel-related problems (EGR/DPF).
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Main drawback: high fuel consumption + risk of timing chain issues on certain model years.
👉 Ideal if you don't drive much.
ML 63 AMG
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The naturally aspirated 6.2 V8 is a masterpiece… but demanding :
Fuel consumption, tires, brakes = $$$ -
Few major mechanical defects… if maintained properly.
👉 Passion rather than reason
Gearbox & transmission: caution
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The 7G-Tronic transmission is generally reliable if the oil is changed every 60,000 km.
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Wear on drive shafts/bearings if frequently used off-road or for towing
Absolutely avoid: MLs that have never had a transmission fluid change ➜ premature wear of the torque converter
Electronics & Suspension: Points to Consider
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AIRMATIC suspension : superb comfort but
➜ expensive air springs and compressor to replace -
Reversing camera, GPS, radar: frequent bugs
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Panoramic roof: check for leaks
Personalize your Mercedes ML with our premium accessories
At Euro Racing Parts , we offer a selection of accessories specifically designed for the Mercedes ML :
Carbon fiber mirror caps , black logos, diffusers, and sporty AMG-inspired lines. CarPlay/Android Auto modules to upgrade the infotainment system of older models.
Premium interior : steering wheel paddles, trim, and replacement button to restore your vehicle
All our products benefit from:
✔ Easy installation
✔ Guaranteed compatibility
✔ Free delivery and 1-year warranty
Verdict: Which Mercedes ML should you choose for reliability?
| Model | Verdict | For what |
|---|---|---|
| ML 300/350 CDI (W164 & W166) | ⭐⭐⭐⭐ | Durable and efficient OM642 engine |
| ML 280 CDI | ⭐⭐⭐⭐ | Excellent budget-reliability |
| ML 250 Bluetec | ⭐⭐⭐ | Economical but with increased mechanical stress. |
| ML 350 Petrol | ⭐⭐⭐ | Keep an eye on this (chain) – but simple and reliable |
| ML 63 AMG | ⭐⭐⭐⭐(passion) | Reliable but very high maintenance costs |
🟩 Best used car choice : ML 350 CDI ≈ the most well-rounded, reliable and enjoyable
Tips for a stress-free purchase
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Demand a complete service history (Mercedes or specialist professional).
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Check gearbox and suspension maintenance
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Avoid vehicles with illuminated ABS/ESP warning lights.
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Choose a car that has been driven regularly.
