Mercedes-Benz GLC-Class VS Audi RS Q3
Mercedes-Benz GLC-Class
Likes
- More power and torque
- More fuel efficient
- Stylish cabin
Dislikes
- Misses V8 soundtrack
- Big price rise over previous model
- Smaller boot, no spare tyre
Audi RS Q3
Likes
- 300kW small SUV? Yes please!
- Great dynamics but comfy ride
- Spacious with a decent boot
Dislikes
- Sportback has less headroom
- No standard head-up display
- No spare wheel
Summary
Mercedes-Benz GLC-Class
Let’s make one thing clear from the very beginning - this new Mercedes-AMG GLC63 S E Performance is technically superior to the model it replaces. Whether it’s actually better or not, is the real question at the heart of the matter.
Why? Because, like the C63 sedan stablemate, AMG has opted to replace the previous model’s 4.0-litre twin-turbo V8 engine with a new 2.0-litre four-cylinder hybrid powertrain. It was a move brought about in part because of increasingly stricter emissions standards in Europe, but also ties-in with the German firm’s success in modern Formula One racing.
While the new hybrid system offers more power, more torque and better fuel economy, as the lukewarm response to the C63 has demonstrated, the hard reality for AMG is that its buyers associate it with V8 and even V12 engines. That emotional pull is hard to replace with logic, even if the new model offers technical superiority.
Read more about
- Faster than a Porsche 911 Turbo? 2025 Mercedes-AMG GT63 S E Performance is quickest AMG yet!
- Mercedes-AMG GLC43 2024 review
- 2025 Mercedes-AMG E53 revealed: Bahn-storming petrol-electric hybrid arrives in sedan and wagon form to take on Audi RS6, BMW M5, Maserati Quattroporte Trofeo and Porsche Panamera E-Hybrid
But how does the new powertrain suit the GLC63 - is it just technically better or is it holistically improved?
| Safety rating | — |
|---|---|
| Engine Type | — |
| Fuel Type | — |
| Fuel Efficiency | —L/100km |
| Seating | — |
Audi RS Q3
Think of Audi’s range of high-performance RS models as being like a knives in a kitchen knife block. They’re all sharp but they all do some things better than others. You wouldn’t use a bread knife to cut a tomato, would you? Well, I have before, because it was on the only clean knife and well, anyway it all went wrong, and it was a mess.
So, what kind of knife is the RS Q3, then? See, it’s a small SUV with 400 horsepower. Does it lose its SUV practicality? Is it like always driving an uncomfortable race car? Is it a fake – not really fast and just an expensive little ‘sporty’ SUV?
Well at the launch of the RS Q3 Audi also brought out almost its entire knife block of other RS models. And we drove them back-to-back. So having spent hundreds of kilometres driving both versions of the RS Q3 – the Sportback and the regular SUV version, along with the Audi’s other RS superheroes I know which knife the RS Q3 is and you will too after you read this review.  Â
| Safety rating | |
|---|---|
| Engine Type | 2.5L turbo |
| Fuel Type | Premium Unleaded Petrol |
| Fuel Efficiency | 8.9L/100km |
| Seating | 5 seats |
Verdict
Mercedes-Benz GLC-Class7.7/10
Like I said right from the start, this new, hybrid version of the AMG GLC63 is technically superior to the model it replaces in every meaningful way. It is faster, more powerful and more fuel efficient and therefore a better performance SUV than the model it replaces.
Is it a better model than the one it replaces? Ultimately that will come down to how much stock you put into the soundtrack and your feelings on an AMG not powered by a V8 engine.
Because if you can see past that, then the AMG GLC63 is an absolutely fantastic performance SUV. Not only does the new powertrain make it faster in a straight line, but the chassis is very well-balanced, making for an engaging driving experience.
For those who can look past the smaller engine they will be rewarded with an incredibly fast and rewarding-to-drive member of the AMG family.
Note: CarsGuide attended this event as a guest of the manufacturer, with travel, accommodation and meals provided.
Audi RS Q38/10
The RS Q3 is absolutely worthy of the RS badge – it’s plush, quick, comfortable, handles superbly and doesn’t lose any practicality over a regular Q3. Which knife is it then in the Audi RS model knife block? Well there was a moment on the launch when our convoy encountered roadworks in the bush and it meant everything from an Audi R8 (rear-wheel drive), RS 7, RS 6 Avant to a TT RS were forced to gingerly drive for a couple of kilometres on a bumby dirt road. I was in the RS Q3, with all-wheel drive, more ground clearance and softer suspension with more travel than the others – and it was tempting to stomp on the accelerator and leave the rest in my dust. So, it’s the adaptable one in the block - the small knife you end up using for everything. Â
Note: CarsGuide attended this event as a guest of the manufacturer, with travel and meals provided.
Design
Mercedes-Benz GLC-Class
The GLC63 is unmistakably an AMG from the moment you first lay eyes on it. That’s thanks to the AMG-specific elements, starting with the grille with vertical strikes and the AMG crest on the bonnet; which is now a signature item for the performance sub-brand.
The GLC63 is also fitted with the Night Package II design kit; this adds a darkened grille and black chrome badging to further enhance its visual appeal.
The AMG-specific alloy wheels and more aggressive stance do mean the GLC63 stands out from the rest of the GLC range, helping it look fast even when it’s standing still.
Audi RS Q38/10
Like the household variety Q3 it’s based on, the RS Q3 comes in two body styles: a Sportback which has a sloping roofline giving it coupe looks; and a regular-looking SUV version which has the traditional more tall and upright design.
I’m not a fan of coupe SUV styling because it reduces headroom (read about that below), but the Sportback does look the more venomous of the pair.
That said they both look like little monsters in their RS superhero outfits which includes the aggressive front bumper boasting giant (and functional) air intakes either side of the enormous grille, 21-inch wheels with giant brakes and red calipers, side skirts and thick wheel arch surrounds for a flared guard look, chunky diffuser and huge oval tail pipes with a black finish.
Inside there are leather RS seats with ‘honeycomb’ stitching, metal pedals, and a leather flat-bottomed RS steering wheel, while the doors and dashboard are trimmed with Alcantara and aluminium.
The rest of the interior showcases the Audi’s most up-to-date styling and tech revealed when the Q3 arrived in 2019 – from the integrated 10.1-inch media display to the dash controls which sense when your hand is approaching and light up to help them find their way in the dark.
At 4506mm end-to-end the RS Q3 is a big, small SUV. For a bit of perspective, it's little brother the Q2 is 4190mm long.
Practicality
Mercedes-Benz GLC-Class
Inside the GLC63 is clearly a derivative of the rest of the range, with its C-Class-inspired design and layout, but there’s enough AMG-specific elements to ensure it looks and feels special. This starts with the AMG steering wheel, which comes not only with a thick rim wrapped in Alcantara, but also some AMG special dials to adjust the various performance settings for the powertrain, suspension and transmission.
Then there are the AMG-specific seats, which look good and offer good support for the driver and front seat passenger. The rear seats offer decent space for what is a mid-size SUV, with room enough for two adults or teenagers or three smaller kids.
Those in the back aren’t particularly well looked after though, with only rear air-con vents and small door pockets but no USB charging ports or other small item storage.
The boot is 590 litres, down from 620L in the rest of the range, thanks to the addition of the rear-mounted electric motor. There’s also no room for the temporary spare the rest of the GLC range gets and instead you have to make do with a puncture repair kit.
Audi RS Q38/10
This will depend on whether you buy the Sportback or the regular SUV-shaped RS Q3, but practicality does not vary between them as much as you may think.
The Sportback loses out on headroom for the rear passenger because of its sloping roofline. I can still sit back there but at 191cm (6'3") with amazingly high hair I’m getting pretty friendly with the ceiling. Legroom though is fine – and I have legs for days.
Explore the virtual Audi RS Q3
Having said that, if I was a backseat passenger on a trip further than just down the road I’d prefer to be in the regular SUV-shaped RS Q3 where its tall, flat roofline offers loads of headroom, and legroom is also good.
All RS Q3s, like the Q3, are five seaters, but bags not sit in the squishy middle back seat.
The boot’s cargo capacity is the same for both at 530 litres, which is also equal to an ordinary Q3. If you want to see how high the boot’s load lip is, I demonstrate it in the video above – best not to watch while eating, though.
I’ve never met an Audi with outstanding cabin storage and the RS Q3 is no exception, with small door pockets and a tiny centre console bin.
It does have four cupholders (two up front and two in the back) and the wireless charger living in the hidey hole near the shifter fits my big phone, so it’s not all bad news there.
Next to the wireless charger there are two USB ports (a mini Type-C and a larger Type-B), while the second row has two Type-C USB ports.
There are directional air vents for those in the back, too.
Price and features
Mercedes-Benz GLC-Class
The power and torque figures aren’t the only numbers that have risen sharply, with the GLC63 clearly impacted by a double whammy of inflation and the usual new-car price rise.
The GLC63 now starts at more than $191,814 for the SUV and $198,415 for the Coupe, which represents a nearly $30k increase over the old V8-powered model, which was priced at $164,600 just two years ago. Even for luxury car buyers that’s a big jump, especially when you’re trying to convince people of the merits of the four-cylinder powertrain.Â
That also means it's more expensive than all of its key competitors, including the BMW X3 M Competition, Maserati’s Grecale and the outgoing, petrol-powered Porsche Macan GTS.
To help explain some of this price increase Mercedes-Benz Australia has opted for a high level of standard specification for local cars. Standard equipment includes 21-inch alloys, AMG composite braking, a panoramic sliding sunroof, a unique AMG steering wheel, power-adjustable sports seats in Nappa leather, a head-up display, dual-zone climate control, wireless smartphone charging and a Burmester 3D Sound system.
Also included is the AMG Track Pace suite, for those who want to unleash their GLC on the racetrack.
There’s also a limited run, AMG Edition 1 Package available too, for an additional $12,900. On the outside you get Manufaktur graphite grey magno paint, foiling with colour gradation and large AMG logo on the sides, an AMG Aerodynamics Package, unique alloy wheels with Edition 1 and AMG branding, yellow brake calipers and an AMG fuel filler cap in silver chrome with AMG lettering.Â
Inside there’s AMG Performance seats, AMG Nappa leather in black with yellow contrasting stitching, AMG illuminated door sills, carbon-fibre AMG trim highlights, yellow seat belts and a unique AMG Performance steering wheel wrapped in carbon-fibre and microfibre.
Audi RS Q38/10
The RS Q3 lists for $89,900 for the regular SUV body shape while the Sportback is $92,900.
Both come with the same standard features, including a 10.1-inch media display with Apple CarPlay and Android Auto, sat nav, 12.3-inch digital instrument cluster, a 15-speaker Bang and Olufsen sound system, leather RS steering wheel, proximity key, 360-degree camera, front and rear parking sensors, privacy glass, power tailgate, 'Matrix LED' headlights and three-zone climate control.
The standard RS seats are Nappa leather, the front ones are heated and power adjustable.
Looking at the standard features for a Q3 it’s clear Audi has fitted the RS Q3 with everything it has for the model – a lot of the equipment such as the sound system, climate control and LED headlights are optional on a ‘normal’ Q3.
Some of these features had to be optioned on the previous RS Q3, too, so relative to the outgoing model the new car is better value.
Compared to it’s rivals the Audi is good value, too. The Mercedes-AMG GLA 45 is $91,735 while the BMW X3 M40i is nudging $110K. Â
Under the bonnet
Mercedes-Benz GLC-Class
This is what lies at the heart of the AMG GLC63’s success or failure. As I mentioned at the beginning, the previous generation’s 4.0-litre twin-turbo V8 has been replaced by an F1-inspired plug-in hybrid powertrain.
But don’t think that means AMG is suddenly focused on efficiency over performance. When AMG says the powertrain is inspired by the brand’s success in Formula 1 racing, what it means is the battery and electric motor provides a significant performance boost to support the internal combustion engine, not just save fuel.
To that end the combination of the turbocharged 2.0-litre four-cylinder petrol engine and the rear-mounted electric motor produces an impressive 500kW and 1020Nm. That’s a massive jump over the 375kW/700Nm made by the outgoing V8.
Audi RS Q39/10
Ordinary Q3s have four-cylinder engines which make no more than 132kW, but the RS Q3 has a 294kW 2.5-litre five-cylinder turbo-petrol engine. Plus, with 480Nm there’s whopping torque for a small SUV.
This five-cylinder also powers the Audi TT RS and the RS 3 and is suited well to small and agile beasties like these, and also to the RS Q3 with its responsive and energetic ‘boosty’ nature. Aud’s 'S tronic' seven-speed dual-clutch auto shifts fast sending the drive to all four wheels.Â
Efficiency
Mercedes-Benz GLC-Class
Mercedes makes no secret that the battery is designed for performance, not saving fuel. It only has a 14km EV range but can recharge quickly on the move to provide a power boost when needed.
But despite all that, the GLC63 is actually significantly more fuel efficient than the old V8, using a claimed 7.3L/100km, which is a massive 4.9L/100km improvement over the old model. Although, on our day-long test drive we didn’t manage to come close to that claimed figure and instead saw returns around 11L/100km, albeit after a lot of spirited open-road driving.
Audi RS Q37/10
High-performance cars with combustion engines love fuel and lots of it. Audi officially says the RS Q3 should use 8.9L/100km over a combination of open and urban roads. We’ll be able to test that once we have an RS Q3 in our garage, but either way, that’s on the thirsty side.
Driving
Mercedes-Benz GLC-Class
Anyone who still believes in the adage ‘there’s no replacement for displacement’ hasn’t driven a modern turbocharged and hybridised engine. The GLC63 is a demonstration of the metaphorical and literal power of modern technology, combining an extremely efficient and potent internal combustion engine with an electric motor to make enormous real-world performance.
To be blunt, the GLC63 feels like a rocketship out of corners, launching with a ferocity and relentlessness the old V8 simply can’t match. It shouldn’t come as a surprise, a mid-size SUV with 1020Nm was always going to have plenty of performance, but even so it’s a shock to the system every time you give the GLC63 full throttle. Officially AMG claims it takes just 3.5 seconds to run 0-100km/h and has an electronically limited top speed of 275km/h - mighty impressive figures for a five-seat mid-size SUV.
To help get all that torque to the road, AMG deploys torque distribution technology that allows for it to be split an even 50/50 front/rear all the way to 100 per cent to the rear tyres.
Other technologies deployed to enhance its handling include AMG Ride Control suspension with adaptive damping and rear-axle steering. There’s also eight AMG Dynamic Select driving modes and four AMG Dynamics settings (Basic, Advanced, Pro and Master), so it’s a complex vehicle that is designed for the enthusiast.
While it’s easy to drive around town, once you get out on the open road you can really get a sense of the GLC63’s performance potential. Beyond just its powertrain the suspension offers good body control and the rear-axle steering helps it feel agile and responsive.Â
It’s not perfect though. At times the complexity of the system does lead to some hesitation when you put your foot down. It certainly lacks the linear power delivery of the old V8 and makes for a slightly trickier driving experience at times.
As for the sound, which is one of the biggest elements missing from the V8, Mercedes has added AMG Real Performance Sound, which features a pressure sensor in the exhaust that picks up on the engine note and plays it through the speaker system. It certainly helps make for a louder, more noticeable engine noise, but it still sounds more like an A45 than the previous GLC63 and for many would-be buyers, that’s a major turn-off.
Audi RS Q39/10
In the intro I likened the RS model range to a knife block full of all well-crafted sharp things, each with different purposes.
At the launch of the RS Q3, Audi also introduced its other new and updated RS models to us, from the RS 7 and RS 6 Avant to the TT RS and even the R8 supercar.
The meat cleaver is definitely the RS 6 Avant which feels like a luxury locomotive with seemingly never-ending sledgehammer acceleration.
I’m beginning to regret the knife analogy because I don’t know knives very well. But I do know cars and the RS Q3 is probably the opposite to an RS6 Avant in that it’s small and agile, with an energetic engine that pauses only to catch its breath in the form of building its boost before sling-shotting you towards the next corner. And it’s loud inside - even with the windows up.
I was impressed by the ride comfort which never became harsh even in 'Dynamic' mode. The suspension is soft enough for acceleration and braking to make the nose pitch and dip, but handling, body control and composure is excellent.
While you can shift gears yourself using the paddles in manual mode, that transmission is best left in auto and in the 'S' setting. You’ll get the full noise under hard acceleration and lightning quick shifts to go with it.
Regular Q3s take eight to nine seconds to accelerate from 0-100km/h. The RS Q3 can do it in 4.5 seconds, which is getting into properly quick territory where steering wheels also becomes a handrails for something to hold onto as you’re yanked down the road with superb all-wheel drive traction.
The same 2.5-litre five cylinder is in the RS 3 Avant but that weighs about 200kg less and can hit 100km/h in 4.1 seconds. But the only way I can sit in the back of an RS 3 is if I put my knees under my chin – not so with the RS Q3.
Safety
Mercedes-Benz GLC-Class
The GLC63 comes standard with a comprehensive suite of safety features including 'Distronic' (Mercedes’ name for adaptive cruise control), 'Active Lane Keeping Assist', 'Blind Spot Assist', 'Traffic Light Assist' and 'Adaptive Highbeam Assist'. It also includes Mercedes’ 'Pre-Safe' accident anticipation system - which pre-tensions the seat belts and will even play a white noise to protect your ears if it senses a crash is imminent.
A parking system that includes a 360-degree camera and active parking assist is also included.
The GLC range was awarded a five-star ANCAP rating in 2022, which pre-dates the latest testing protocols, so doesn’t provide a like-to-like comparison for vehicles tested after that date.
Audi RS Q39/10
ANCAP gave all variants of the Q3 the maximum five-star rating in 2018 with the exception of the RS Q3 which is yet to be tested.
What I can tell you is that for this model Audi’s made the safety features standard across the range and this includes the AEB system with pedestrian and cyclist detection, rear cross traffic assistance, lane departure warning with lane keeping assistance.
The airbag count is also the same as a regular Q3 at six, and like that SUV you’ll find three top tether anchor points and two ISOFIX mounts for child seats across the second row.
Q3s come with a space saver spare, but the RS Q3 has a puncture repair kit.
Ownership
Mercedes-Benz GLC-Class
The GLC63 is covered by Mercedes Australia’s usual five-year/unlimited kilometres warranty.
As for maintenance, Mercedes offers service plans, spanning three to five years. Three years will cost you $5025, $6455 for four years and five years is priced from $7180. Servicing intervals are 12 months or 20,000km, whichever comes first.
Audi RS Q36/10
The RS Q3 is covered by Audi’s three-year/unlimited kilometre warranty which not only falls behind in duration compared to mainstream brands but also its direct rival Mercedes-Benz which now has five-year/unlimited kilometre coverage. Â
Service intervals are every 12 months or 15,000km with a three-year plan ($2320) or five-year plan ($3420) available.