10 Most Reliable Used Mercedes-Benz Cars You Can Buy Today
Few automakers carry as much weight in the used-car conversation as Mercedes-Benz. The Stuttgart brand built its legend on cars that simply refused to wear out — machines so thoroughly engineered that taxi fleets around the world ran them into seven-figure mileage and kept coming back for more. That reputation has taken some hits over the decades, but the right Mercedes, bought used, still represents one of the smartest ways to get into a genuine luxury car without gambling on reliability.
So which models are actually worth your money? We dug into reliability ratings, owner forums, and high-mileage real-world stories to identify ten reliable Mercedes-Benz cars that stand out as exceptional used buys — models that pair genuine luxury car refinement with the kind of dependability you can actually count on.
Mercedes-Benz W123
Reliability Score: N/A
In its classic era, Mercedes-Benz was renowned for near-faultless quality and reliability, and few models embody that reputation better than the W123. A forerunner of what would eventually become the E-Class, the W123 was the brand’s mid-size sedan option. Production ran from 1975 to 1986, with license-built Chinese models continuing until 1988. It’s frequently cited as one of the most reliable Mercedes sedans ever made, alongside several others we’ll cover later.
The W123 was offered with a wide choice of engines, ranging from non-turbo diesels to a 2.7-liter inline-6. The engine that consistently earns the most praise for reliability is the 3-liter inline-6 diesel found in the 300D. Sold in the US from 1977 to 1981, it produced 77 hp and 115 lb-ft of torque — glacial even by the standards of its day. The trade-off, however, is reliability on a legendary scale. All W123s are remarkably hard to kill, but the diesels outlast even other W123s. It’s very common for 300Ds to reach 300,000+ miles with proper care.
If your priority is reliability and you want a classic Mercedes that’ll run forever, the W123 is one of the best choices out there. Keep up with the proper maintenance and it will quite literally last a lifetime. It may not be spectacularly fast or spectacularly good-looking, but it’ll never let you down.
- Avg. Yearly Maintenance Costs: N/A
- Est. Maintenance Costs During First 10 Years: N/A
- Total Recalls: N/A
- Worst Years To Buy Used: N/A
2014 Mercedes-Benz E-Class (W212)
Reliability Score: 87/100
The first modern Mercedes on this list, the W212 E-Class was produced from 2008 to 2016 and came in a wide variety of models — including the E63 AMG and E63 S AMG super sedans. For the final three years of production, a facelift brought a more contemporary look, significant mechanical updates, and the introduction of the E63 S variant.
Thanks to that broad range of variants, the W212 E-Class offered an equally broad engine lineup. Options spanned from 2.0-liter inline-4 turbodiesels in base trim producing roughly 135 hp, all the way up to the 5.5-liter twin-turbocharged V8 in the E63 S, good for 577 hp and 590 lb-ft of torque. Several models, including the AMG versions of the facelifted W212, were also available with all-wheel drive. What all these variants share, though, is strong reliability. Enthusiasts consistently point to models equipped with the M276 3.0-liter and 3.5-liter V6 petrol engines as the most dependable. That engine is powerful enough for most drivers and also underpinned the efficient E400 Hybrid powertrain.
Some people don’t view modern Mercedes-Benz models as reliable or as worthwhile to own as the classic ones. The W212 E-Class proves that isn’t the case. This 2010s Benz has proven to be a solid choice for anyone who wants a comfortable, practical car that’ll never let them down.
- Avg. Yearly Maintenance Costs: Between $750 – $950
- Est. Maintenance Costs During First 10 Years: $7,500 – $9,500
- Total Recalls: 9
- Worst Years To Buy Used: N/A
2010 Mercedes-Benz C-Class (W204)
Reliability Score: 84/100
The Mercedes-Benz C-Class hasn’t always been a reliable car. The early-2000s models, in particular, earned a distinct reputation for unreliability. By the time the W204 generation entered production in 2006, however, those problems had been resolved. Not only was this C-Class generation a genuinely good car overall, it was also the first to receive the monstrous 6.2-liter V8 as an engine option — the powerplant behind the C63 AMG, now widely regarded as one of the best AMG models available on the used market.
The W204 is considered one of the most reliable modern Benzes. Enthusiasts caution against the C180, which can suffer timing chain problems, while the timing chains on the six-cylinder engines are regarded as considerably more robust. Whichever variant you choose, you’ll be getting a car that spends very little time in the repair shop.
- Avg. Yearly Maintenance Costs: $720
- Est. Maintenance Costs During First 10 Years: $7,200
- Total Recalls: 3
- Worst Years To Buy Used: 2007-2009
2016 Mercedes-Benz C-Class (W205)
Reliability Score: 84/100
The W204 isn’t the only modern C-Class with a strong reliability reputation. The W205 that replaced it also has a well-earned name for dependability. As with the W212 E-Class, the W205 received a significant mid-cycle facelift — arriving for 2018 — that brought mechanical changes and the introduction of semi-autonomous driving aids.
Like the W204, the W205 comes with a wide variety of engines and trim levels, ranging from small and efficient turbodiesels to the 4.0-liter twin-turbocharged V8 in the C63 AMG. According to enthusiasts, the most reliable W205s are those fitted with the twin-turbocharged M276 3.0-liter V6 petrol. This engine produced 328–362 hp and 350–380 lb-ft of torque in pre-facelift models, and 328–380 hp and 350–380 lb-ft of torque in post-facelift cars. The higher-output twin-turbo M276 also powers the C43 AMG — a more accessible AMG option that lacks an AMG-built engine but delivers the looks and feel of a full AMG model.
The W205 C-Class isn’t the highest-quality modern Benz, but that has more to do with its entry-level positioning than any inherent unreliability. Pick one up used and you’ll have one of the best-value Mercedes models on the market.
- Avg. Yearly Maintenance Costs: $739
- Est. Maintenance Costs During First 10 Years: $12,942
- Total Recalls: 13
- Worst Years To Buy Used: 2017
Mercedes-Benz S-Class (W140)
Reliability Score: N/A
The Mercedes-Benz S-Class is not only the brand’s most prestigious model, but one of the most prestigious cars in the world — and for good reason. It has been the transport of choice for heads of state, government ministers, and CEOs for decades. Arriving in an S-Class signals wealth, success, and an appreciation for quality. Many enthusiasts argue that the W140 is the finest S-Class ever built, precisely because it is the ultimate expression of the classic over-engineering Mercedes was once famous for. Originally slated to launch in 1989, it was pushed back to 1991 to give the engineering team more development time. That thoroughness came at a cost, and its high price drove some buyers toward alternatives like the Acura Legend or Lexus LS400.
The W140 S-Class was offered with a broad range of engines, from a 3.0-liter inline-6 turbodiesel up to a 6.0-liter V12. The V12 was developed specifically to counter the V12-engined BMW 7 Series, and was a key reason for the car’s delayed launch — Mercedes’ top brass insisted on having a V12 option and were willing to wait for it to be done properly.
If you’re considering a W140, owners and enthusiasts have offered consistent advice over the years. First, post-1995 cars are generally the better buy, as earlier examples can have biodegradable wiring harnesses that cause problems with age. Second, some owners have flagged issues with the rear air conditioning and ADS adaptive suspension — both systems have quirks that make them costly to repair when they fail. For the most reliable and easiest-to-maintain powertrain, most owners point to the S320 with its 3.2-liter M104 inline-6 petrol engine.
- Avg. Yearly Maintenance Costs: N/A
- Est. Maintenance Costs During First 10 Years: N/A
- Total Recalls: N/A
- Worst Years To Buy Used: N/A
Mercedes-Benz W124
Reliability Score: N/A
When Mercedes-Benz set out to replace the long-serving W123, the brief was clear: match its indestructible build quality in a more modern package. The W124 delivered on that promise. It has been a common sight across Europe, North America, and Africa ever since its introduction — a testament to a car that is both genuinely comfortable and tough as nails.
Like its W123 predecessor, the W124 was available with a vast choice of engines, from modest petrols and non-turbo diesels through to the 6.0-liter V8 in the E60 AMG. There was also the brilliant 500E, widely regarded as one of the greatest sleeper sedans ever made. As with the W123, the diesel variants are considered the most reliable, but any well-maintained W124 will last a lifetime. Many W124s have covered 200,000–300,000 miles without significant issues, and there are documented examples that have surpassed a million miles — many of them former taxis, whether in European cities during the 1990s or more recently in the major metropolises of Africa.
Like the W123, the W124 is a classic Benz that has earned its reputation for faultless reliability. It’s another old-school Mercedes that won’t cause you problems, provided you keep it properly maintained. For anyone who wants a comfortable classic without the usual classic-car headaches, it remains one of the best choices on the market.
- Avg. Yearly Maintenance Costs: N/A
- Est. Maintenance Costs During First 10 Years: N/A
- Total Recalls: N/A
- Worst Years To Buy Used: N/A
Mercedes-Benz S-Class (W126)
Reliability Score: N/A
The W140 may be the most celebrated S-Class, but the W126 deserves equal recognition. Like the W140, it was among the most comfortable, technically advanced, and over-engineered cars available in its era — a fact reflected in how many W126s remain on the road today. The W126 offered a broad engine range, including one inline-5 and two inline-6 diesel options, plus multiple inline-6 and V8 petrols. At the top of the range sat the 5.5-liter V8 in the 560 SEL, producing 238 bhp and 287 lb-ft of torque in US-market trim, and 275 bhp and 317 lb-ft in its home market. That made it a genuinely formidable luxury car for its era, capable of challenging what Rolls-Royce and Bentley had to offer.
Owners consistently report that their W126s have been incredibly reliable, at least by classic-car standards. They can cover hundreds of thousands of miles with very few problems and, driven daily, can prove as dependable as a modern car. As with the W123 and W124, the W126 is a compelling option for anyone who wants the classic-car experience without the classic-car drama. For many, it remains the most reliable Mercedes ever made.
- Avg. Yearly Maintenance Costs: N/A
- Est. Maintenance Costs During First 10 Years: N/A
- Total Recalls: N/A
- Worst Years To Buy Used: N/A
Mercedes-Benz G-Class (W463)
Reliability Score: N/A
The Mercedes-Benz G-Class may not be the first model that springs to mind when you think of the legendary German automaker, but it is one of the coolest cars it has ever produced — and one of the most reliable. The G-Wagen traces its roots to a design Mercedes-Benz originally developed for military use, which means toughness, off-road capability, and dependability in all conditions are baked into its DNA.
For the most reliable G-Class experience, older is better. The W463 generation, built from 1990 to 2018, is widely considered the most dependable. The G300TD, G500, and G55 AMG — in both naturally aspirated and supercharged forms — have been specifically singled out as the most reliable variants. Earlier W463s also tend to be more dependable than later examples, largely because they use a manual transfer case that is less prone to failure.
The G-Class in its earlier forms isn’t the most glamorous SUV, and it doesn’t offer the best value for money in its segment. But it is exceptionally reliable, and it will take you pretty much anywhere. Having a vehicle with military roots does have its perks.
- Avg. Yearly Maintenance Costs: $975
- Est. Maintenance Costs During First 10 Years: N/A
- Total Recalls: 22
- Worst Years To Buy Used: N/A
Mercedes-Benz M-Class (W164)
Reliability Score: N/A
The Mercedes-Benz M-Class has always been something of an ugly duckling in the three-pointed star’s lineup. The first-generation model was developed during the Daimler-Chrysler era and never shook its reputation for poor quality — it’s still remembered as one of the least reliable Mercedes models ever produced. The W164 generation changed that narrative considerably. It has built a reputation as one of the sturdiest and most dependable Mercedes SUVs, with the ML350 in particular earning strong praise. That model’s 3.5-liter V6 produces 272 hp and 258 lb-ft of torque. If you want something more exciting, the 6.2-liter V8-powered ML63 AMG delivers 510 hp and 465 lb-ft of torque. While that model may not carry the same guaranteed-reliability status as the lower-powered MLs, its extensive parts-sharing with other AMG Mercedes models at least keeps maintenance relatively straightforward.
The W164 M-Class may not be as flashy or desirable as rival luxury SUVs, and the shadow of the early M-Class’s poor reliability did lasting damage to the nameplate’s image. The later GLE-Class seems to have finally earned the respect the M-Class deserved. Even so, the W164 remains a strong used-market choice regardless of which variant you choose.
- Avg. Yearly Maintenance Costs: $1,020 (ML350)
- Est. Maintenance Costs During First 10 Years: N/A
- Total Recalls: N/A
- Worst Years To Buy Used: N/A
Mercedes-Benz GL-Class (X164)
Reliability Score: N/A
There are plenty of big SUVs, but the Mercedes-Benz GL-Class is something else entirely — gargantuan in the best possible way. Built to take on the Tahoes, Yukons, and Escalades of the world, it is long, wide, and capable of seating seven adults in genuine comfort.
One of the most popular used Mercedes SUVs, the X164 GL-Class shares its platform with the W164 M-Class and, as a result, shares several of its powertrain options. These include a 5.5-liter twin-turbocharged V8 producing 550 hp and 561 lb-ft of torque in the GL63 AMG. The X164 also inherits the W164’s reputation for strong reliability. Owners report that the petrol engine options can reach 250,000 miles or more without major issues. The diesel engines can be more problematic, with known seizure issues and added strain on the transfer case due to their higher torque output. Models fitted with the Airmatic air suspension can also develop faults with that system, and repairs tend to be expensive.
If repair costs are a major concern, the X164 GL-Class may give you pause. But properly maintained, it is one of the most reliable Mercedes SUVs ever built — and a considerably classier alternative to the typical large American seven-seater.
- Avg. Yearly Maintenance Costs: Approx. $1,295 (model dependent)
- Est. Maintenance Costs During First 10 Years: N/A
- Total Recalls: N/A
- Worst Years To Buy Used: N/A
Sources: BenzWorld.org forums, Mercedes-Benz, Peach Parts Forums (Pelican Parts), Reddit (r/mercedes_benz).
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