Lexus LX vs Mercedes-Benz Gls450

What's the difference?

Huge specification in terms of convenience and safety gear are matched by an equally huge range of abilities in this vehicle. As well as rock hopping with the best of them, this is also a phenomenal touring rig and a more-than-capable off-roader. Of course, whether you can see yourself clambering up the side of a muddy creek crossing in $202,000 worth of vehicle is a personal matter, but rest assured, the Lexus will do it if you ask it to.

In the case of the hybrid LX, however, the vehicle now has an extra dimension to cover off, and from what we can see, it does take the efficiency and running costs of the big wagon to a new, better place. Mind you, that may only be the case if diesel continues to cost a dollar-a-litre more than petrol at the bowser.

The shift to petrol power also brings with it a level of mechanical background noise that we’re not entirely sure fits the Lexus legend, while additions such as the camera-based rear-view mirror system seems to be a conversation starter rather than an actual improvement.

The GLS450d impresses as an entry-level grade, as it’s a more family-friendly allrounder than the specialised AMG and Maybach variants. Its combination of a torque-rich diesel 48V hybrid drivetrain, air-cushioned suspension and plush interior are as well suited to luxury urban travel as they are to grand touring, where its heavy towing and generous load-carrying capabilities can shine. Whether it’s worth around $200K drive-away, only those who shop at the top end of town can decide.

In a styling sense, that big, bold, deep grille at the front won’t be to everybody’s liking, but we reckon it’s pretty well matched with the otherwise taut skin of the LX’s body.

Inside, the plush look and feel is the dominant factor, but if you look really closely, there’s a fair bit of generic Lexus stuff on show. Is that a criticism? Hardly. The leather looks and feels luxe and only some hard plastics (such as on the door cappings) belie the car’s LandCruiser origins.

This is an imposing vehicle in extravagant S-Class tradition, riding on an expansive 3135mm wheelbase and stretching more than 5.2 metres (5215mm) long and more than 2.0 metres (2030mm) wide with a turning circle that's nudging 13 metres.

However, it’s just under 1.8 metres (1798mm) tall, so there’s no clearance issues when accessing multi-storey carparks. And with its side-steps (or ‘running boards’ in nostalgic Benz speak) most adults can step rather than climb aboard, although passengers of shorter stature during our test noted that assist handles on the A and B pillars would be handy.

Central to its sophisticated chassis design is adaptive air suspension, which uses a pneumatic or ‘airbag’ form of springing with adaptive damping to continuously optimise ride comfort and handling response according to road conditions and driving dynamics (see Driving).

The GLS’s styling is clean and uncluttered with tasteful restraint evident in its chrome and satin-chrome highlights, yet it projects a majestic quality with its prominent four-louvre grille and elegantly spoked alloy wheels.

The spacious and sumptuous seven-seat interior is visually pleasing and practical, with a subtle blend of surface treatments, contrasting tones, lots of soft-touch surfaces and exposed stitching. This is combined (thankfully) with physical dials, switches and ‘piano key’ buttons to control numerous interior functions, in preference to distracting touchscreen prompts.

Like many hybrids, cargo capacity takes a bit of a blow. In this case, placement of the battery under the cargo floor means a reduction in luggage capacity from 1109 litres to 899 litres. In the seven-seat variant, capacity is 883 litres with the rearmost row folded flat. The rear seat folds 60:40 and there are good, solid tie-down points in the rear. There’s no under-floor storage, however, apart from a small compartment just behind the rear seat which locates the tools and safety triangle.

The tailgate is powered (if a bit slow in its action) and there are cup-holders atop each suspension tower, clearly a hang-over from the seven-seat variant which is not available in F Sport trim. The cargo blind is a good addition, as is the 1500-Watt power socket in the cargo bay.

In the cabin, there are plenty of grab handles and the side steps give shorter folk a leg up when entering or leaving. Once you’re in, the front seats are terrifically comfortable as well as featuring a massage function on top of the heating and cooling functions. The steering wheel is also heated.

Paddle shifts might seem odd in a vehicle like this, but they are brilliant in off-road situations, although you need to first select manual mode on the shifter to have the paddles hold each gear for more than a few seconds in most of the on-road driving modes.

Speaking of the shifter, Lexus has seen fit to once again reinvent this simple control. You now need to pull the handle towards you and up for Reverse, across and down for Drive while Park remains a separate button even though it looks like just another icon on the lever.

A pair of cup holders live over to the passenger’s side of the centre console, and there are a pair of USB charge ports as well as an HDMI port in the dashboard. But the switches for the power windows are located almost directly under the driver’s interior door pull, forcing some unorthodox wrist geometry.

At least the buttons for the climate control and off-road functions such as diff locks and ride height are, indeed, buttons and not menu items. The simple knob to control the stereo on-off and volume is a great touch, too. So is the cooled centre console under a cover that opens from either side.

The rear seat is big and wide but the high floor dictated by the body-on-frame construction means those with long legs will have their knees bent while ever they’re in the back seat. The seat cushion itself is pretty flat, too, but the backrest does recline through a wide range of angles.

Reading lights, lots of air vents and a full set of climate controls ease the pain of riding in the back, but if you want cup holders, you need to keep the centre rear seat free so the armrest that houses the holders can be lowered and snapped open. Adding to the impression that plenty of thought has gone into the rear seat environment are the pull-up sun blinds on each window. Why don’t all cars have these?

Although it has a hefty 2655kg kerb weight, our test vehicle’s 3420kg GVM rating provides a useful 765kg of load capacity, which should comfortably absorb the combined weight of up to seven occupants and light luggage. Or with the third row of seating folded, five occupants and heavier luggage.

It’s also rated to tow up to 3500kg of braked trailer and with its sizeable 6920kg GCM (or how much weight it can legally carry and tow at the same time) it can carry its maximum load while towing its maximum trailer weight.

So, that’s commendable practicality, given it would be well suited to owners that need to tow large caravans, boat trailers, horse floats etc in style without having to compromise much (if at all) on either passenger numbers or luggage capacity.

Driver and front passenger space and comfort is exceptional, as you’d expect. Storage includes a large glovebox plus a bottle holder and bin in each door. The front of the centre console has two USB-C ports, wireless phone charging and heated cupholders, while the rear of the console has a large storage box with a third USB-C port and padded lid that doubles as a comfy elbow rest.

Even tall passengers in the second row of seating enjoy spacious comfort, given I’m 186cm and with the driver’s seat set in my position I have ample knee clearance, foot room and head space.

However, the central passenger must contend with a transmission tunnel in the floor and shoulder room would be squeezy for three large adults, which is okay for short trips but a maximum of two would be ideal for longer journeys.

The rear of the centre console also treats second-row passengers to a pair of USB-C ports, adjustable air-vents and a control panel that allows independent climate adjustment.

There’s also a large bin/bottle holder in each door plus storage nets on each front seat backrest. The centre seat backrest folds flat to allow long items (skis etc) to slot between the outer backrests. And it also serves as a fold-down armrest, containing two cupholders and a lidded slimline compartment that’s ideal for hidden phone storage.

The third row is uncommonly spacious, even for tall people, with padded armrests on each side containing cup holders and twin USB-C ports.

The carpeted rear luggage area has four load-anchorage points, a first aid kit and 12v socket. With the third-row seats upright it offers 355 litres of load volume, which increases to 1350 litres with the third row folded and 2400 litres (or 2.4 cubic metres) with both the second and third rows folded.

Our Polar White test vehicle, which is the base grade in the three-tiered GLS range, comes standard with a 3.0-litre inline six-cylinder turbocharged diesel engine with 48V mild hybrid technology, nine-speed automatic transmission, permanent all-wheel drive and active air suspension for a list price of $189,100.

This pricing is higher than comparative entry-level grades offered by the two marques which dominate sales leadership in this segment, comprising the BMW X7 xDrive40d M Sport ($179,500) and Lexus LX500d AWD ($158,700).

The GLS450d’s standard features include 22-inch AMG alloy wheels with Continental 325/40 R22 tyres and a collapsible spare, ‘AMG Line’ body styling enhancements, aluminium-look illuminated side-steps with non-slip rubber studs, multi-beam LED headlights and more.

Step inside the keyless interior and you’ll find ‘Hey Mercedes’ voice activation, fingerprint scanner (which memorises individual comfort settings for up to seven users), panoramic sunroof, heat-insulating dark-tinted rear privacy glass and the ‘Premium Plus Package’ that includes heating/cooling for the front seats, heated rear seats, head-up display, separate front/rear climate control zones, heated cupholders and more.

There’s also a concert hall-like Burmester surround sound system controlled by a central touchscreen with digital radio and Apple CarPlay and Android Auto connectivity, plus wireless phone charging, multifunction Nappa leather sports steering wheel and USB ports front and rear.

Driver assistance includes the ‘Parking Package’ (360-degree camera, active parking assist and transparent bonnet), ‘Mirror Package’ (auto-dipping rear-view mirror and electric folding door mirrors with puddle lamp projection of the brand logo) and ‘Driver Assistance Package’ (blind-spot assist, exit warning, speed sign recognition, lane keeping etc) all included as standard equipment.

Of course, Mercedes-Benz offers numerous extra-cost options including a 3500kg towing package plus interior, exterior, suspension and wheel enhancements (including Nappa leather trim) for those who want their GLS with the lot, which can easily push the list price beyond $200K.

The hybrid driveline of the vehicle we’re looking at here marks a further expansion of buyer choice when it comes to how their Lexus LX is powered. The twin-turbocharged petrol and diesel variants will continue alongside the newcomer, although you can bet Lexus (and Toyota) will be watching the sales charts closely to see where consumer tastes fall.

The hybrid set-up here starts with the twin-turbocharged 3.4-litre petrol V6 (a lot of people - Toyota included - are calling it a 3.5, but at 3445cc, it’s not) from the Lexus LX600.

But instead of bolting directly to the 10-speed transmission, in this case, there’s a single electric motor and clutch unit sandwiched between the engine and transmission. That means the Lexus retains mechanical four-wheel drive, while the electric motor can provide extra urge for acceleration or towing as well as offering EV-only operation when it’s required (mainly in stop-start traffic).

Crucially, it also means the vehicle retains those traditional off-road qualities of low-range gearing and permanent four-wheel drive. The electric motor also contributes torque to the equation when the driver selects either Rock, Dirt or Deep Snow modes to maintain a steady flow of Newton metres.

The petrol V6 contributes a healthy 305kW and 650Nm to the picture, while the electric motor adds a further 36kW and 250Nm. When all that’s harnessed up, there’s a total of 341kW of power and 790Nm of torque on tap, allowing for a braked towing capacity of 3500kg. It also makes this variant the torquiest Lexus LX ever.

Interestingly, Lexus says the conventional 12-volt starting system and alternator for the petrol engine, means that unit could continue to operate if any part of the EV system failed.

One of the big questions over hybrid drivelines in off-road conditions is what happens if the vehicle suddenly finds itself partly under water. In this case, says Lexus, there are additional waterproofing measures which should prevent any problems mid-creek.

The F Sport grade gets a Torsen (torque-sensing) rear differential and firmer dampers for an overall sportier feel.

At 2780kg, the LX hybrid is heavy, and is at least 100kg more than the LX600 due to the batteries and other hybrid gear.

The GLS450d comes standard with a 3.0-litre turbocharged inline six-cylinder diesel producing 270kW of power at 4000rpm and 750Nm of torque between 1350-2800rpm.

This is paired with a 48V mild-hybrid system comprising a 48-volt battery (charged by regenerative braking) and an integrated starter-generator which provides both seamless engine stop-start and up to 15kW/200Nm of extra power and torque during acceleration.

A nine-speed torque converter automatic provides the choice of manual shifting using the steering wheel-mounted paddles, along with several selectable drive modes.

The active all-wheel-drive system continuously adjusts the engine’s torque delivery between front and rear axles (and individual wheels as needed) to maintain optimum traction and handling.

Here’s where the hybrid driveline really comes into its own. On paper, at least.

Despite the added kiloWatts and Newton metres, the 700h manages an official fuel consumption figure of 10 litres per 100km. That compares with 11.9/100km for the 305kW LX600, although it’s still more than the 8.9L of the 227kW diesel-powered LX500d.

But the hybrid’s big advantage will come in city and suburban traffic where the stop-start nature of things will enable the driveline to harvest braking energy and turn that back into electricity for the battery.

Our testing showed an average of 11.2 litres per 100km in mixed conditions which blew out to 13.0 litres with more urban running. That’s pretty handy in the context of a vehicle like this and won’t be far from the real-world numbers of the diesel LX.

The Lexus carries 98 litres of petrol, split between one 68-litre tank and a 30-litre sub tank. That should give it a theoretical range of almost 800km, but again, that will depend largely on where and how it’s used.

Mercedes-Benz claims official combined consumption of 7.8L/100km and the dash display was showing 9.0 when we stopped to refuel at the completion of our 368km test, which included the usual mix of suburban, city and highway driving with up to five passengers at times and light luggage.

Our own figure, calculated from fuel bowser and tripmeter readings, was close at 9.5 which is outstanding sub-10L/100km economy for such a substantial vehicle in mostly metropolitan use. Therefore, based on our own consumption figure, you could expect a real-world driving range of around 950km from its 90-litre diesel tank.

At low speeds, threading your way through traffic or parking, the LX feels like it needs a lot of real estate. Which makes sense given the 5.1-metre overall length that puts it on par with a lot of dual-cab utes. The width of almost two metres plays into things, too, and reversing down the average driveway will often have the sensors chirping at you constantly.

What’s interesting, though, is the way the Lexus seems to shrink once you’re up and running in a more open setting. Even a winding road reveals a car that is easy to place in corners and seems to feed back lots of the right sort of information in terms of what the wheels are doing and where they’re placed. The result is that you can actually hustle the LX along quite smartly if you need to.

The ride remains composed yet there’s a level of control that helps keep the big, high LX relatively flat through corners and responding sharply to the helm. Even those huge wheels and tyres and their corresponding unsprung mass don’t intrude. It’s a great trick.

Less easy to appreciate, however, is the driveline, specifically the twin-turbo petrol V6. Frankly, it’s just not as refined as we were expecting. I wouldn’t mind betting Lexus has tuned the exhaust system to make the LX sound like there’s a petrol V8 under that heavily sculpted bonnet. And at low revs, it kind of works with a rhythmic, muted, yet guttural sort of bass coming through.

But rev it harder and the engine soon reveals itself to be a V6 with all the secondary vibration and resonance that implies. Simply, this vehicle is neither as smooth nor as quiet as the Lexus brand would suggest and the harder you rev it, the more it descends into NVH (noise, vibration and harshness) territory. The issue is made worse by the fact that the rest of the package is so darn quiet.

Even the stop-start - a technology that is now well understood - doesn’t seem quite as slick as it should be. Taking off from a green light with the petrol engine stopped, the Lexus often produces a small `sonic bump’ from the driveline as the V6 fires into life. It’s felt more than heard. But it’s still puzzling in the context of this make and model.

The transmission, meantime, is as silky as you’d imagine with upshifts and even downshifts that are barely perceptible. It would be nice, though, if the transmission obeyed the paddles a bit more faithfully. As it is, the chosen gear is only held for a few seconds unless you also pull the shift lever into manual mode.

I’ll also take issue with the rear-view mirror that includes a camera view as well as a conventional mirror option. I can see the point of having a camera-view mirror (when the cargo area is piled high, for instance) but I’ve never yet met one that works properly. The problem is that the camera view that pops up on the mirror’s screen is never as faithful as it should be. Also, if you wear glasses to read, you’ll also need them to focus on the image properly. While a conventional mirror has the same depth of field as looking through the windscreen, the camera-generated view does not. Also, when used through a wet rear window in low light, the camera view is borderline useless. This tech clearly has a ways to go.

It’s an enjoyable vehicle to drive, with multiple power adjustments for the seat and steering wheel combined with a large left footrest which provide supreme driver comfort and support.

The powerful and responsive turbocharged six-cylinder diesel and nine-speed auto are well suited to this application. The engine’s ample torque provides spirited acceleration from standing starts, taking only six seconds to reach triple-digit speeds.

This drivetrain would be well suited to heavy towing duties, given the 48V mild-hybrid system can contribute an extra 200Nm (in addition to the engine’s 750Nm), which raises the total theoretical torque output to almost 1000Nm.

The active air suspension provides a wonderfully cushioned ride that floats over bumpy roads, while maintaining excellent handling response and surprising agility. These commendable chassis dynamics, combined with the powerful and responsive drivetrain, makes the vehicle feel smaller and lighter than its dimensions and kerb weight would suggest.

Overall, it’s difficult to fault from a driver’s perspective, with the only exception being the voice activation function. This is often triggered by words or phrases other than ‘Hey Mercedes’ resulting in regular interruption of conversations. This needs some fine tuning.

The GLS does not have an ANCAP rating as it’s yet to be tested, but comes standard with a suite of passive and active safety features including nine airbags, auto emergency braking (AEB) with pedestrian detection and junction assist, blind-spot monitoring, traffic sign recognition, head-up display, rear cross-traffic alert, lane-keeping, adaptive cruise control with ‘distance assist’ (autonomously brakes/accelerates in heavy traffic), front/rear parking sensors, 360-degree camera and more.

There’s also two ISOFIX and three top-tether child seat anchorages in the second row, plus two more of each in the third.

Lexus offers a five-year, unlimited-kilometre warranty on its vehicles and throws in three years’ worth of subscription to the Lexus Encore owner privileges and benefits program. Those extras include Lexus on Demand, valet parking, roadside assistance and even complimentary access to Qantas airport lounges.

There’s also five years of capped-price servicing available.

As well as the overall five-year/unlimited kilometre warranty, there’s eight years and 160,000km of cover for the hybrid battery. That can be extended to up to 10 years provided the battery is checked for degradation every year after the fifth year.

Servicing for the LX is every six months or 10,000km which is much more frequent than much of the competition, but reflects the heavy-duty nature of the vehicle.

Lexus has about 30 dealerships in Australia, primarily in urban locations, but for many servicing and repair jobs, a Toyota dealership or service centre should be able to handle things on the LandCruiser 300-Series-based LX.

The GLS comes with a five-years/unlimited km warranty (better than BMW and Lexus) and five years of roadside assistance. Scheduled servicing is every 12 months/25,000km whichever occurs first.

Mercedes-Benz offers capped-price pre-paid servicing packages with three, four or five-year terms. For example, the total upfront cost of the minimum three-year term is $4090, or an average of $1363 per service.