Mercedes GLC Coupe C253: best year and the diesel trap | CDE

The Mercedes GLC Coupe C253 (2016 to 2022) is the sloped-roof GLC, and on the used market it is cheaper than the badge suggests: clean diesels now start around £20,000. Our verdict is simple. Buy the 2019-on facelift with the OM654 2.0-litre diesel and full Mercedes history; treat the early OM651 2.1-litre cars as the diesel trap to negotiate hard on or avoid. Below: engines, the facelift, faults, the pre-purchase checks, and the running costs that decide it.

OM651 vs OM654: the diesel trap, and which Mercedes GLC Coupe C253 to favour

The engine choice is the whole decision here. Pre-facelift 220d and 250d cars (2016 to 2019) use the older OM651 2.1-litre four-cylinder diesel: a known, fixable unit, but the one with the longer fault history and harsher note. From the 2019 facelift, the 220d and 300d switch to the newer OM654 2.0-litre diesel, which is smoother, cleaner and the one we would pay more to get. Both run a timing chain, not a belt, so the check is for a chain that rattles on cold start, not a belt-change bill. Our view: the OM654 facelift diesel is the rational used buy, and the early OM651 is the trap unless the price reflects it.

The petrols and PHEV widen the choice. The 300 4Matic petrol gained EQ Boost 48-volt mild-hybrid assistance at the facelift and suits low-mileage town use where a diesel never warms through. The 350e plug-in hybrid is the company-car tax pick but the most complex used proposition: it only works if the battery still charges and holds usable range, so verify rather than assume. For real motorway miles, the 300d still makes the strongest case on cost. The platform and engines are shared with the standard SUV, so our Mercedes GLC X253 used buyer’s guide is worth a read if the coupe roofline costs you boot space you need.

AMG 43 and 63: the fast Coupes and what they cost to run

Two AMG versions sit above the range. The GLC 43 Coupe uses a twin-turbo 3.0-litre V6 (390PS after the facelift) and is the usable, fast pick. The GLC 63 and 63 S Coupe use the 4.0-litre twin-turbo V8, the 63 S making 510PS and hitting 62mph in around 3.8 seconds. Both are quick but drink fuel, chew tyres and sit in the highest insurance and VED brackets, so they are a heart buy; the 43 is the sensible AMG. For a fast-SUV shortlist, our BMW X5 G05 used buyer’s guide covers the rival six-cylinder cars.

The facelift: why 2019-on is the year to buy

The clearest dividing line in the C253’s life is the 2019 facelift. Pre-2019 cars run the older COMAND system with a rotary controller, which feels dated and drives most infotainment complaints. The facelift brought the much better MBUX twin-screen dash with the “Hey Mercedes” voice assistant, mild-hybrid petrols, the cleaner OM654 diesel and subtle styling tweaks. Buy a 2019-onward car and you get the better cabin, the better diesel and prices that have softened to value. The same facelift logic runs across the range, as our Mercedes C-Class W205 used guide sets out for the saloon and estate.

Used prices in 2026: what to pay

Prices have fallen far enough to make this an interesting used buy. On a cinch and Auto Trader inventory scan checked 6 June 2026, clean pre-facelift 250d AMG Line Coupes start around £20,000, a 2019 250d sits near £23,400, and a 2020 facelift 300d 4Matic AMG Line Premium lands around £27,000. The full cinch span that day ran from roughly £20,000 to £73,000, AMG and late facelift cars at the top. Our target is a 2019-on facelift 300d 4Matic with MBUX and full history in the high £20,000s to low £30,000s.

Common faults and the pre-purchase checks that matter

Most C253 faults are nuisance rather than catastrophe, but a few cost real money. On pre-facelift cars, expect the odd COMAND glitch or freeze, and on any car check every electrical function works, since the recurring complaints are electrical. If air suspension is fitted (more common on AMG trims), confirm it raises and sits level with no warning lights, because a failed strut is expensive. On a short-trip diesel, watch for DPF and AdBlue warnings; on a 350e, watch it accept a home charge and ask for evidence of usable battery range. The 9G-Tronic gearbox is dependable when serviced, so look for clean fluid history. Cross-check warranty cover in our BMW vs Audi vs Mercedes approved used warranty comparison before you sign.

Service history, MOT and the DVSA recall lookup

Paperwork separates a cared-for C253 from a forecourt punt. Insist on full main-dealer or specialist service history, and read the MOT record on the gov.uk MOT history service for advisory patterns on tyres, brakes and suspension that show how the car was used. Before you pay, run the registration through the free DVSA vehicle recall check, which lists any outstanding recall for that exact car, and get written confirmation that any flagged work is done. A clean MOT history, a full service file and a clear recall status are worth more than a shiny set of wheels. Honest John’s owner-reported Real MPG data for the GLC is a useful check on the economy a given engine actually returns.

Running costs: insurance group, servicing, VED and depreciation

The C253 is an executive SUV to run. Insurance lands high: mainstream 220d and 300d Coupes typically sit in the upper Thatcham groups and AMG cars in the top brackets, so price up cover on the exact variant first. Servicing follows Mercedes’ condition-based ASSYST schedule, usually yearly or roughly 15,500 miles, with main-dealer services dearer than an independent specialist. On road tax, any GLC registered after 1 April 2017 pays standard flat-rate VED, and cars over £40,000 list when new (most AMG Line and AMG cars) carried the expensive-car supplement for years two to six. Depreciation is now the buyer’s friend: the steepest drop is behind these cars. The table below pins the headline figures to their sources.

Sealing the deal: what to confirm before you pay

Pull it together in one order. Confirm the engine and year first, since a 2019-on OM654 facelift is worth a premium over an early OM651 car. Then price up insurance and check the VED supplement status on the exact variant, because both move the monthly maths more than the sticker. Clean paperwork and the right engine means you push on cosmetic items; thin history means you walk. For a different body on the same Mercedes mechanicals, our Mercedes E-Class W213 used guide and the wider CDE used buying guides are the next read.

Our take

The Mercedes GLC Coupe C253 is a strong used buy if you choose the right one, and an avoidable headache if you do not. Our view: target a 2019-on facelift 300d 4Matic with the OM654 diesel, MBUX and full Mercedes history in the high £20,000s to low £30,000s. That car gives you the cleaner engine, the better cabin and prices that have already taken their depreciation hit. The diesel trap is the early OM651 220d or 250d on thin paperwork: it can be a sound car, but only buy one if the price reflects the older engine and dated COMAND screen. Skip any 350e that cannot prove its battery health, and treat the AMG cars as heart buys you can fund. Get the engine, year and paperwork right and this is a lot of premium SUV for the money; get them wrong and the savings evaporate at the first big bill.