Two of Mercedes' largest SUVs, head to head. The GLE is the refined mid‑sizer; the GLS is the full‑size flagship. We compare space, engines, reliability, running costs and replacement economics using real 2025 UK enquiry data.
The GLE wins for the vast majority of buyers — it offers S‑Class‑level luxury, strong performance and generous space at a significantly lower price and running cost than the GLS. The GLS only makes sense if you genuinely need seven seats, maximum passenger space, or the extra towing capacity of the full‑size platform. For most families and individuals, the GLE is the smarter, more cost‑effective choice.
Full spec comparison, five‑year ownership cost analysis, and a clear verdict for your lifestyle below.
| GLE (W166/V167) | GLS (X166/X167) | |
|---|---|---|
| 2025 UK Enquiries | 262 [EM-VERIFIED] | 120 [EM-VERIFIED] |
| Typical Engine Options | OM654, OM642 diesel, M276, M256 petrol, hybrid | OM642, OM654, M276, M256 petrol, hybrid |
| Boot Space (seats up) | ~690 litres (5‑seat) | ~890 litres (7‑seat) |
| Seating | 5 seats (optional 7) | 7 seats (standard) |
| Recon Engine Supply & Fit (diesel) | £3,200–£5,500 | £3,500–£6,500 |
| Typical Real‑World MPG (diesel) | 39–43 | 35–39 |
| Defining Failure Points | AdBlue, OM642 swirl flap, timing chain (M276) | Same, plus air suspension issues on older X166 |
| Best For | Families needing space, luxury and efficiency in a manageable package | Largest families, chauffeur duties, ultimate presence and towing |
The GLE is the better choice for nearly every buyer. It offers 90% of the GLS's luxury and space for significantly less money, both upfront and in running costs. The GLS's main advantages — standard seven seats, slightly more luggage space and greater towing capacity — are only essential for a minority of buyers with very specific needs. Our data shows GLE enquiries outnumber GLS by more than 2:1, a clear reflection of its broader appeal and better value proposition. Unless you absolutely need the GLS's extra size, the GLE is the smarter purchase.
The GLE is Mercedes' mid‑size luxury SUV, sitting between the GLC and the GLS. It's offered in two generations: the W166 (2015–2019) and the newer V167 (2019–present). Engine choices mirror the GLS for the most part: the OM654 2.0‑litre four‑cylinder diesel (194–265 bhp) is the most popular in the V167, delivering 39–43 mpg in real‑world driving, while the OM642 3.0‑litre V6 diesel (258 bhp) was used in older W166 models. The M276 3.0‑litre V6 petrol (362 bhp) and the inline‑six M256 petrol (362–429 bhp) offer smooth, powerful alternatives. The GLE is significantly lighter and more agile than the GLS, making it a better daily driver, especially in urban environments. It also offers optional third‑row seating, though the space in the third row is tighter than in the GLS — it's really for occasional use, not regular adult occupancy. Key risks are shared with the GLS: AdBlue system issues, OM642 swirl flap failures, and timing chain stretch on the petrol engines. For a detailed breakdown, see our OM654, OM642 and M276 Knowledge Centres. The GLE's superior fuel economy, lower insurance groups and cheaper servicing make it the more cost‑effective choice for most families.
The GLS is Mercedes' full‑size SUV, the successor to the GL‑Class. It's the largest SUV Mercedes makes, offering seven seats as standard with genuine third‑row space for adults — a rarity in the luxury SUV segment. It shares its platform with the S‑Class, and that shows in its ride quality and interior luxury. The X166 generation (2016–2019) used the OM642 3.0‑litre V6 diesel (258 bhp) and the M276 3.0‑litre V6 petrol (362 bhp), while the newer X167 (2019–present) uses the OM654 diesel, the inline‑six M256 petrol, and more powerful V8 options. Fuel economy is the GLS's biggest weakness: the extra weight (over 200 kg heavier than the GLE) reduces economy by 4–6 mpg across the board. Its size also makes it challenging in multi‑storey car parks and narrow urban streets. However, for those who need the space — such as large families, chauffeur operators or those who regularly tow heavy trailers — the GLS's 3,500 kg towing capacity and vast interior make it the only choice. The GLS also has air suspension as standard on most models, giving it a supremely comfortable ride on motorways. For owners who need that capability, the extra running costs are easily justified. See our OM642 swirl flap page for a key failure point on older models, and our M276 and OM654 pages for more detail.
The GLE is significantly cheaper to own than the GLS over a typical five‑year period, largely due to lower fuel consumption and lower purchase price (and therefore lower depreciation). The GLS's higher purchase price, higher VED, higher fuel bills and higher insurance premiums add up to a substantial difference. Over 60,000 miles, the GLE typically saves its owner £3,000–£5,000 compared to the GLS, assuming comparable engine choices. However, if you genuinely need the GLS's extra space or towing capability, those savings are irrelevant — the GLS is the only tool for the job. For those on the fence, our ownership cost calculator can provide a personalised comparison based on your mileage and driving patterns.
| Metric (5 yrs, 60k miles) | GLE (OM654 diesel) | GLS (OM654 diesel) | GLS (OM642 V6 diesel) |
|---|---|---|---|
| Fuel cost | £7,800–£8,400 | £8,600–£9,200 | £9,800–£10,600 |
| Servicing (scheduled) | £1,400–£1,800 | £1,600–£2,100 | £1,700–£2,200 |
| Tax (VED) | £1,000–£1,200 | £1,100–£1,300 | £1,200–£1,400 |
| Insurance (estimated) | £2,800–£4,000 | £3,200–£4,500 | £3,500–£5,000 |
| Total estimated | £13,000–£15,400 | £14,500–£17,100 | £16,200–£19,200 |
These figures are [ESTIMATED] based on UK market data and our proprietary enquiry patterns. Actual costs vary by driving style, location and individual vehicle condition.
GLE — plenty of space for five adults and luggage, lower running costs, easier to live with day‑to‑day.
GLS — the only Mercedes SUV with genuine third‑row space for adults. If you regularly carry more than five, the GLS is essential.
GLS — 3,500 kg towing capacity vs the GLE's 2,700 kg. For caravans, horseboxes or heavy trailers, the GLS is the only sensible choice.
GLE — decisively cheaper to buy, tax, insure and fuel. Our 5‑year model shows savings of £3,000–£5,000 over the GLS.
Both SUVs are exceptional vehicles. The right choice isn't about which is 'better' — it's about which fits your lifestyle. Use our ownership cost calculator to input your specific mileage and get a personalised comparison.
Yes — the GLS is significantly longer, wider and taller, with more interior space, especially in the third row. The GLS is a full‑size SUV; the GLE is a mid‑sizer.
They share the same engines and core components, so reliability is broadly identical. The GLS's extra weight may cause slightly faster wear on brakes and suspension, and its air suspension is a potential failure point on older models.
The GLE is cheaper to insure due to its lower value and generally lower power outputs. Expect a 15–25% premium for the GLS.
Yes — the GLE can tow up to 2,700 kg, which covers most medium and large caravans. The GLS's 3,500 kg capacity is better for heavy horseboxes or large trailers.
GLS — the GLE's optional third row is tight for adults, while the GLS offers genuine seven‑seat comfort. If you regularly carry six, the GLS is the only sensible choice.
382 Combined EnquiriesGLE and GLS analysed from real 2025 UK data.
A Real VerdictWe name a winner for most buyers, and explain when the GLS is the better choice.
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