Used Mercedes-Benz GLC (X253, 2016-2022): Buyer's Guide

The 2016-2018 GLC300 used an engine called the M274. It cracks pistons. Mercedes quotes $11,000 to $23,820 to replace the long block. No recall was ever issued. The 2019 facelift swapped in a new engine, the M264. The M264 cracks exhaust valves. Cylinder head replacement runs $3,000 to $10,200. No recall for that one either.

That's not a reason to skip the GLC. It's a reason to know exactly what you're buying before you sign anything.

The X253 generation (2016-2022) is one of the most polished small luxury SUVs built in that era. The ride is exceptional. The interior holds up well. The driving feel is distinctly Mercedes, which means something to people who care about that. But this generation also has documented mechanical risks that don't appear on most "GLC review" articles, because those reviews are written at 10,000 miles, not 60,000.

This guide is for the person doing homework the night before they go look at a used GLC. Read it first.

This Generation at a Glance

The X253 GLC replaced the GLK in 2016 and ran through the 2022 model year, when Mercedes launched the X254 second generation. Two meaningful inflection points define the X253:

2016-2018 (Pre-facelift): M274 2.0-liter turbocharged four-cylinder, NTG 5.0 infotainment controlled via a rotary dial, pre-LED standard lighting, 241 hp.

2019-2022 (Post-facelift): New M264 2.0-liter turbocharged four-cylinder with 48-volt EQ Boost mild hybrid system, MBUX infotainment with touchscreen, revised LED headlights, 255 hp. This was a significant update, not just a styling refresh.

A coupe version of each (called the C253) shared all powertrains and most of the reliability profile. This guide covers both.

All variants are available with year links on CarScout: 2016, 2017, 2018, 2019, 2020, 2021, 2022.

Powertrain and Trim Breakdown

GLC300 4Matic (2016-2018): The M274 Problem

The M274 2.0-liter turbocharged four-cylinder is a smooth engine when it works. When it doesn't, it's extremely expensive.

Mercedes issued a Technical Service Bulletin for a defective wrist pin in the M274. The pin fails and allows the piston to crack. Cracked pistons throw particles into adjacent cylinders. The engine knocks, power drops, and the repair requires either rebuilding the long block or replacing the engine entirely. Dealer quotes range from $11,000 to $23,820 for full engine replacement. No recall was ever issued. No warranty extension was ever offered to most M274 owners. A class action complaint was filed in California in November 2022 on behalf of M274 owners across C-Class, E-Class, and GLC vehicles, but as of 2026 it has not produced a settlement applicable to GLC300 buyers.

The failure does not occur at a predictable mileage. MBWorld.org threads document M274 piston failures at 40,000 miles and at 110,000 miles. The common thread is a cold-start knock or rattle that is often misdiagnosed as a minor issue before the engine fails catastrophically.

Also common on 2016-2017 models: the PCV regulator valve fails with a P052E error code, causing rough idle and hesitation. Repair cost runs $1,200-$1,800. It's not engine-ending, but it's an indicator that the 2016-2017 pre-facelift models had genuine early-production teething.

The 2016-2018 GLC300 is only worth buying at a price that reflects the risk. If you're paying $22,000 for a 2017, you need to acknowledge that engine replacement could add another $12,000 to that figure. A pre-purchase inspection with oil analysis for metallic particles is not optional on these years.

GLC300 4Matic (2019-2022): The M264 and a Different Problem

For the 2019 facelift, Mercedes replaced the M274 with the M264. The M264 adds 14 hp, incorporates a 48-volt mild hybrid system (EQ Boost), and improved the cold-start behavior and fuel economy. On paper, it addresses the M274's problems.

In practice, the M264 has its own documented failure. Exhaust valve defects cause cylinder head failures. Cylinder 3 is most commonly affected, followed by cylinder 1. GLCForums.com has documented multiple owners experiencing this failure before 60,000 miles. A 2022 GLC300 with 57,000 miles received a cylinder head replacement quote of $10,200. Other owners report failures at 39,500 miles in well-maintained, dealer-serviced vehicles.

Mercedes has acknowledged similar issues in the closely related M260 engine and extended warranty coverage to M260 owners. No such extension exists for M264 owners as of 2026.

The 48-volt EQ Boost system itself has been largely trouble-free on the X253. NHTSA opened an investigation into 48V system issues on the newer X254 generation, not the X253. The technology adds complexity, but it has not been a major complaint driver on this generation.

Also documented: P0191 fuel pressure sensor faults across 2019-2022 GLC300s. Usually a sensor replacement, not a pump failure. Budget $300-$600 if the code appears.

The 2019-2022 is still the better buy compared to the 2016-2018, because the failure modes are more expensive to trigger with the M274 and the M264 offers a wider window where a leakdown test can catch developing issues before purchase. A compression and leakdown test on cylinders 1 and 3 before buying any M264-equipped GLC300 is worth every dollar of its cost.

GLC43 AMG 4Matic: The V6 Biturbo

The GLC43 uses Mercedes' M276 3.0-liter biturbo V6. Two hundred and sixty-two horsepower more than the base GLC300, all-wheel drive that's genuinely configured for performance, and AMG-tuned suspension. This is what the GLC should feel like when you want to drive it.

The M276 is more inherently reliable than either 2.0-liter variant, but it accumulates wear items that owners on tight maintenance budgets tend to defer.

Timing chain. The M276 uses a two-stage chain drive with tensioners that wear over time. Insufficient oil supply accelerates the wear. The symptom is a cold-start rattle that fades within a minute as oil pressure builds. That rattle is not something to monitor over time. It means the tensioners are failing. Replacement before the chain stretches costs $2,000-$4,000 at an independent specialist. A jumped chain can destroy the engine. MBWorld.org's GLC43 subforum has documented multiple timing chain failures where owners waited on the rattle and regretted it.

Oil consumption. Past 80,000 miles, many M276 engines develop above-normal oil consumption from piston ring and valve seal wear. Check the dipstick. An engine running low between changes is burning oil. Budget for more frequent top-offs and plan for a consumption check at purchase.

Upper timing cover oil leaks. The M276 leaks oil from the upper timing cover area with some regularity. Messy but not immediately dangerous. The fix runs $800-$1,500 at a shop with Mercedes experience.

Tire wear. GLC43 owners on performance summer rubber report front tire consumption as fast as 6,200 miles. All-season rubber lasts longer, but owners who want the grip the 43 was designed for should budget $400-$800 per front tire per year.

The GLC43 with verifiable service history is an excellent vehicle. Without service history, especially on timing chain intervals, it's a gamble.

GLC63 AMG and GLC63 S AMG: The V8 Biturbo

The GLC63 arrived for 2018 with the M177 4.0-liter biturbo V8 that also powers the C63, E63, and AMG GT. Standard GLC63: 469 hp and 479 lb-ft. The S version: 503 hp and 516 lb-ft. EPA combined fuel economy for both: 15 mpg. The AMG Speedshift MCT 9-speed is one of the best dual-clutch transmissions in the business.

This is a genuinely exceptional vehicle with genuinely exceptional operating costs.

Oil consumption. M177 owners report consumption above Mercedes' stated acceptable rate, particularly past 60,000 miles. Check the oil before every test drive. Review the service records for top-off frequency.

Carbon buildup. Direct injection means fuel does not wash the intake valves. Carbon accumulates and eventually causes rough idle and reduced power. Walnut blasting the intake at 60,000-mile intervals is standard practice for M177 owners: $300-$600 at a German car specialist.

Turbocharger wear. Early-production M177 units saw some premature turbo wear. Replacing a single turbocharger on the M177 is a $5,000+ parts and labor exercise. Some owners have been quoted over $8,000 CAD for a single unit at dealer rates.

Transfer case (4Matic+). The GLC63 uses the 4Matic+ system with active torque vectoring. The transfer case chatters and clunks through low-speed turns when the fluid is overdue or the internals are wearing. Fluid service at 40,000-mile intervals is mandatory, not optional. Transfer case replacement runs $5,000-$8,000.

Brake costs. A full brake replacement on a GLC63 S runs $2,000-$3,000 for OEM pads and rotors at all four corners. This is not a one-time event. Budget it as a recurring item.

The GLC63 is worth buying used if you can genuinely afford to own it. If your plan is to buy it cheap and figure out repairs as they happen, the math does not work in your favor.

GLC350e 4Matic PHEV (2016-2019): Skip It

The plug-in hybrid combines the M274 engine with an electric motor for 313 hp combined. The concept is sound. The ownership experience is not.

You get the M274's piston failure risk combined with high-voltage battery degradation. Older GLC350e units show reduced electric range, sometimes as low as 11 miles on a full charge. The charging system has its own failure modes, including a "Hybrid system malfunction" warning that strands the vehicle in ICE-only mode with reduced performance. Battery replacement on a used PHEV outside warranty is expensive enough to wipe out years of fuel savings.

Unless you're presented with a specific GLC350e that has a recent documented battery health test showing full capacity, this variant adds complexity without a commensurate benefit.

Trim-Specific Notes

The GLC trim structure (Base / Sport / Premium) is mostly a packaging game. The choices that actually matter:

Panoramic sunroof. The fixed panel between the windshield and the opening panel has been subject to two separate NHTSA recall campaigns: 17V715000 (insufficient bonding on 2017-2018 models) and 21V197000 (inadequate bonding following prior replacement on 2014-2020 vehicles). Both address the same failure mode: the panel can separate from the vehicle at speed. Before buying any X253 GLC with a panoramic roof, run the VIN and verify both campaigns are closed.

MBUX vs. NTG 5.0. The 2019 facelift's most noticeable interior change is the switch from NTG 5.0 (controller-based) to MBUX (touchscreen with "Hey Mercedes" voice control). MBUX is a meaningful upgrade in usability. If you're choosing between equivalent-condition 2018 and 2019 models, the infotainment difference alone is a legitimate reason to pay more for the 2019.

Air suspension. Not standard on the X253. Optional on GLC43 and GLC63 models as AMG Ride Control. Unlike the older GLK, which had widespread air suspension issues, the X253 mostly runs coil springs. If you find an AMG variant with air suspension, confirm service history.

Driver Assistance Package. Adds Distronic adaptive cruise and active lane keeping on 2016-2020 models. The radar sensor associated with this system prompted a recall (19V540000 covering 2020 GLC models). Verify that campaign is closed.

Which Model Year to Target Within This Generation

The 2022 GLC300 4Matic is the best X253 you can buy. The M264 cylinder head issue did not disappear, but the complaint volume is lowest and the MBUX software is the most mature version of the system. Expect to pay $3,000-$5,000 more than a comparable 2020 model. That premium buys a vehicle with the fewest documented problems in the generation.

The 2021 is a reasonable runner-up. The single open campaign (headlight adjustment) is a straightforward dealer fix.

The 2019-2020 range is where buyers often look for value. The technology is there. So is the M264 cylinder head risk at scale. A leakdown test on cylinders 1 and 3 before purchase removes most of the guesswork.

The 2016-2017 is only defensible at prices low enough to absorb a potential M274 engine replacement. That price should be significantly lower than market rate. A 2016 GLC300 at $16,000 with clean service history and an oil analysis showing no metallic contamination is a very different proposition than the same car at $21,000.

Pre-Purchase Inspection Checklist

GLC300 (2016-2018, M274 engine)

• Cold-start the engine before anyone warms it up. Listen for knocking, clattering, or ticking that does not fade after 90 seconds. Persistent knock is the M274 piston failure presenting itself. Walk away.
• Ask for documentation of any TSB work performed for the wrist pin defect. If the dealer or private seller cannot produce it, assume it was not done.
• Request an oil sample before purchase. Send it to a lab for metal particle analysis (Blackstone Labs charges around $30). Elevated iron indicates cylinder wall wear. This test is cheap insurance against a $15,000 mistake.
• Verify recalls 18V177000 (seat belt) and 17V715000 (sunroof) are closed. Run the VIN at /tools/recall-lookup.

GLC300 (2019-2022, M264 engine)

• Request a compression test and leakdown test at purchase. Any cylinder showing leakdown above 20% indicates cylinder head issues. Walk away or price in the repair.
• Cold-start the vehicle yourself. Rough running or misfires in the first 30 seconds, even briefly, can indicate exhaust valve problems developing.
• Verify recall 24V070000 (headlights) is closed. Verify 19V822000 (2019 steering) or 20V651000 (2020 steering) for those model years.
• Ask for dealer service records. A 2019-2022 GLC300 with documentation of Service A/B at the correct intervals has a better chance of not having the valve issue develop early.

GLC43 AMG (M276 V6)

• Cold start before the engine warms up. A rattle that fades within 30-60 seconds is the timing chain tensioner warning. This is not a "monitor it" situation. Factor $2,000-$4,000 for timing chain service into the purchase price or walk.
• Ask for oil service records. Extended oil change intervals accelerate timing chain wear.
• Check the oil on the dipstick. Low oil on a higher-mileage GLC43 suggests consumption between changes.

GLC63/63 S AMG (M177 V8)

• Ask for oil consumption history from service records. How often was the oil topped off?
• Check for smoke at warm idle under throttle. Blue smoke indicates active oil burning.
• Look for oil residue around turbo outlet hoses and the valve cover area.
• Budget $2,000-$3,000 for the next brake service regardless of claimed condition.

All Variants

• Verify both panoramic sunroof recall campaigns (17V715000 and 21V197000) on any equipped vehicle.
• Test the 9G-Tronic during a controlled deceleration from 35 mph to a stop. The shift from 3rd to 2nd should be imperceptible. A clunk or jolt suggests transmission adaptation issues or early mechanical wear. Software adaptation resets often resolve this; mechanical wear does not.
• Ask when the transfer case fluid was last serviced. Dark, metallic fluid is overdue. Service runs $300-$400 at a German car specialist.
• Check all four window regulator motors by cycling every window. The X253 has some regulator failures reported by owners, and replacement runs $300-$500 per window.

Running Costs

Key cost benchmarks:

• Oil change (0W-40 Mercedes Genuine): $110-$175 at dealer, $90-$130 at an independent German car specialist
• Service A: $250-$300
• Service B: $500-$700
• Brake pads and rotors (front axle): $600-$900 OEM
• Brake pads and rotors (rear axle): $400-$600 OEM
• Transfer case fluid service: $300-$400 every 40,000 miles
• Transmission fluid service: $300-$400 every 60,000 miles

Everything runs 30-50% less at a qualified independent shop than at a Mercedes dealer. The parts are the same; the labor rate is the difference.

FAQ

Is the Mercedes-Benz GLC300 reliable? Year-dependent. The 2021-2022 GLC300 with the M264 engine is reasonably reliable with a 73/100 reliability score for the 2022 from Auto Reliability Index. The 2016-2018 with the M274 carries a meaningful engine failure risk with no recall protection. The 2019-2020 models sit in between: better than pre-facelift, but with M264 cylinder head issues emerging at scale.

What GLC X253 years should I avoid? Avoid 2016 and 2017 unless the price accounts for potential M274 engine replacement ($11,000-$23,820). Both years had 79-115 NHTSA complaints and the highest complaint volume in the generation. The 2018 is the same engine risk at a slightly lower price point. The 2020 had 143 NHTSA complaints, the highest post-facelift count in the generation.

How long does the Mercedes GLC last? With consistent maintenance (oil on schedule, transmission and transfer case fluid every 40,000-60,000 miles), a GLC300 can reach 150,000-200,000 miles. The engine failure risks discussed above are not inevitable; many M274 and M264 units run without incident. But when they do fail, repairs are expensive enough that deferred maintenance accelerates the timeline significantly.

Is the GLC43 AMG worth buying used? Yes, if you buy one with verifiable service history. The M276 V6 biturbo is a more durable engine than either GLC300 four-cylinder in most respects. The timing chain and oil consumption items are manageable with proper maintenance. Buy a neglected GLC43 and you get the worst of both worlds: AMG operating costs with compromised reliability.

Is a used GLC63 AMG a good buy? If your annual repair budget can absorb $2,500-$5,000, the GLC63 is one of the most compelling used luxury performance vehicles available. 500+ horsepower, genuinely capable AWD, and an interior that holds up. If the budget is tight, the GLC63 is not the right vehicle. The math on deferred maintenance does not work.

Bottom Line

The 2022 GLC300 4Matic is the X253 to buy. It has the most refined version of MBUX, the fewest documented problems in the generation, and the lowest recall count. The M264 cylinder head risk exists, but the 2022 has the shortest ownership history of any year in this guide, meaning documented failures are rarer.

Before any offer: run the VIN through a recall check. On a 2019-2022, request a leakdown test. On a 2016-2018, request an oil analysis with metal particle counts.

CarScout members can track price drops on specific GLC300 years and trims as inventory shifts. Start tracking at usecarscout.com.

Data sourced from the NHTSA recalls database, CarScout market and recall data, EPA fuel economy records, and real owner experiences from MBWorld.org (GLC X253 and GLC43/63 AMG subforums), GLCForums.com, BenzWorld.org, PeachParts Mercedes-Benz Forum, PistonHeads UK, and carcomplaints.com. See the full Mercedes-Benz GLC 300 market data for current pricing and inventory.