2014 Mercedes-Benz GLK350 — Full Specifications
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The 2014 Mercedes-Benz GLK350 is an SUV powered by a 3.5L 6-cyl premium gasoline engine. Its most fuel-efficient configuration returns around 26 mpg (UK) / 22 mpg (US EPA) combined, with 25–26 mpg (UK) across all configurations. Owners often keep a Mercedes-Benz GLK350 workshop manual to hand for servicing and repairs.
Compared with the 2013 Mercedes-Benz GLK350: Fuel economy is essentially unchanged at around 26 mpg (UK) combined. The engine line-up listed by EPA is unchanged.
Full Specifications
| Engine | 3.5L 6-cyl |
|---|---|
| Transmission | Automatic 7-spd |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | Rear-Wheel Drive |
| Body Style | SUV |
| Fuel Economy (UK) | 26 combined / 23 urban / 31 extra-urban mpg |
| Fuel Economy (US EPA) | 22 combined / 19 city / 26 highway mpg |
| CO₂ Emissions | 257 g/km |
| EPA Greenhouse Gas Score | 5 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $3,750 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2014 Mercedes-Benz GLK350, all with the 3.5L 6-cyl engine. Combined fuel economy ranges from 21 to 22 mpg (US), or 25 to 26 mpg (UK), depending on engine, transmission and drive. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 3.5L 6-cyl | Automatic 7-spd | 4-Wheel Drive | 25 | 21 (19/25) | 265 | $3,900 |
| 3.5L 6-cyl | Automatic 7-spd | Rear-Wheel Drive | 26 | 22 (19/26) | 257 | $3,750 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
Owner Essentials for the 2014 Mercedes-Benz GLK350
Running Costs: 2014 Mercedes-Benz GLK350
Covering around 8,000 miles a year in a 2014 Mercedes-Benz GLK350 at 26 mpg combined, expect roughly 1,399 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $3,750 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Planning a road trip? Grab a road trip packing list. Only need this car occasionally? See our buy vs rent comparison.
2014 Mercedes-Benz GLK350 Safety Ratings (NHTSA)
No NHTSA crash-test rating is on record for this model year. The NHTSA rates only a subset of vehicles each year; you can browse every rated vehicle on our NHTSA Safety Ratings hub.
Recalls & Owner Complaints (NHTSA)
NHTSA lists no safety recall campaigns for the 2014 Mercedes-Benz GLK350 as of 6 October 2026. Recalls can be issued years after a model is sold, so it is still worth checking your own VIN.
Owners have filed 126 complaints with NHTSA about the 2014 Mercedes-Benz GLK350. The most-reported areas are Air bags (78), Unspecified (8), Engine (6). Complaints include 5 reported crashes, 1 reported fire, 6 reported injuries, 1 reported death. That is close to the median of 140 complaints across the 6 Mercedes-Benz GLK350 model years in our data.
Used-buyer checklist for the 2014 Mercedes-Benz GLK350
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Air bags (78 owner complaints) — Confirm any air bag inflator or module recalls were completed — enter the VIN at nhtsa.gov/recalls.
- Engine (6 owner complaints) — Listen for unusual noise on a cold start, check for warning lights and ask for the service records.
- Body structure (5 owner complaints) — Inspect for corrosion and for subframe or body-panel damage, especially underneath.
Source: US NHTSA recall and consumer-complaint databases, retrieved 6 October 2026. Complaints are unverified owner reports, not confirmed defects. Check any vehicle by VIN at nhtsa.gov/recalls, and see our guide to checking a used car for recalls.
How It Compares
How does the Mercedes-Benz GLK350 compare to similar SUVs? SUVs in our database average around 27 mpg (UK) combined — this model sits close to that average, within 1 mpg. This comparison is based on 1824 SUVs in our dataset.
At 26 mpg (UK) combined it sits close to the 26 mpg average for Mercedes-Benz models in our database. Its 257 g/km CO₂ figure is 11 g/km lower than the 268 g/km Mercedes-Benz average.
Of the 6 Mercedes-Benz GLK350 model years we cover, the 2014 is the most economical on its best configuration (26 mpg UK combined). See every Mercedes-Benz GLK350 year side by side.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2014 Mercedes-Benz GLK350
Frequently Asked Questions
What engine does the 2014 Mercedes-Benz GLK350 have?
It's fitted with a 3.5L 6-cyl premium gasoline engine, paired with a automatic 7-spd transmission.
What is the fuel economy of the 2014 Mercedes-Benz GLK350?
The most efficient configuration returns around 26 mpg (UK) combined, or 22 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 25 to 26 mpg.
How much does the 2014 Mercedes-Benz GLK350 cost to fuel per year?
The US EPA estimates about $3,750 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
Does the 2014 Mercedes-Benz GLK350 have any recalls?
NHTSA lists no safety recall campaigns for the 2014 Mercedes-Benz GLK350 as of 6 October 2026. Recalls can be issued years after a model is sold, so it is still worth checking your own VIN.
What are the most common problems reported for the 2014 Mercedes-Benz GLK350?
Among the 126 owner complaints filed with NHTSA, the most-reported areas are Air bags (78 complaints), Unspecified (8 complaints), Engine (6 complaints). Complaints are unverified owner reports, not confirmed defects, and raw counts rise with how many cars were sold.
Is the Mercedes-Benz GLK350's fuel economy good for an SUV?
It returns around 26 mpg (UK) combined, against a same-body-style average of roughly 27 mpg among the SUVs we track.