Used Mercedes-Benz GLK 250

What to know before buying: Mercedes-Benz GLK 250

From 1 forum thread and 3 press tests · updated 12/10/2026

What the reviews say

• Two GLK 250 CDI owners reported no defects after 10,000 and 20,000 km; both averaged just over 8 l/100 km.[1]one source
• One owner praised the GLK 250 CDI for direct steering, strong response, lively performance and smooth running.[1]one source
• In normal use, the OM651 was described as matching the OM642 for smoothness and responding more eagerly, though the four-cylinder becomes noisier under load.[1]one source

Typical faults

• One GLK 250 CDI 4Matic suffered failed seals on all injectors at 3,600 km: diesel reached electrical connectors, limp mode followed, and all four injectors plus the engine harness were replaced.[1]one source

  3 600–3 600 km · GLK 250 CDI 4Matic

• GLK owners have reported oil leaks, particularly during sharp temperature changes.[4]one source
• Automatic-transmission jolts and unusual noises have been reported; the source lists an incorrect fluid level or solenoid faults as possible causes.[4]one source
• Owners have reported electrical faults affecting windows, door locks, lighting and the ignition system.[4]one source
• Suspension knocks or noises have been noted, along with isolated cases of water entering the cabin because of inadequate sealing.[2][4]

Which engine and version to take

• A GLK 250 CDI with verified history is worth considering: two owners reported no defects at 10,000 and 20,000 km and consumption just over 8 l/100 km.[1]one source

What to avoid

• Avoid remapped OM651 engines: the source associates tuning with engine failure, burned pistons, high oil use, head-gasket leaks and turbocharger faults.[1]one source

What to check at the inspection

• With the engine cold, check the oil level and inspect for leak traces, paying particular attention to cars exposed to sharp temperature swings.[4]one source
• During the test drive, check that the automatic transmission neither jolts nor makes unusual noises, and verify its fluid level.[3][4]
• Test every window, door lock, light and the ignition system, as faults have been reported in these electrical components.[4]one source
• On an uneven road, listen for suspension knocks and inspect carpets and trim for dampness or evidence of water ingress.[2][4]
• When inspecting a GLK 250 CDI, check the injectors, seals and engine electrical connectors for diesel contamination, and ask whether the car has ever entered limp mode.[1]one source

Verdict

Sources

1. [1]motor-talk.de — Mängelliste beim GLK 250 CDI nach 10.000 km · forum
2. [2]drom.ru — Мерседес GLK-Класс 2005 - 2017 отзывы владельцев · press
3. [3]drom.ru — Мерседес GLK-Класс 2001 - 2017 отзывы владельцев · press
4. [4]bpmers.ru — Mercedes GLK - обзор основных неисправностей · press

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