Mercedes-Benz GLS vs BMW M3 Sedan

A proper head-to-head in South Africa — compare price, performance, fuel economy or electric range, safety and the details that shape long-term ownership.

Mercedes-Benz GLS in South Africa

Mercedes-Benz GLS

GLS 450 d Diesel Mild Hybrid 9-Speed Automatic Current
ZAR 2,350,181 ex-showroom
⚡ 270 kW 🔧 750 Nm ⛽ 12.3 km/l
VS
BMW M3 Sedan in South Africa

BMW M3 Sedan

M3 Competition Sedan with M xDrive Petrol 8-Speed Automatic Current
ZAR 2,190,000 ex-showroom
⚡ 390 kW 🔧 650 Nm ⛽ 12.5 km/l
＋ Add a 3rd car

Decision summary

Mercedes-Benz GLS vs BMW M3 Sedan: the short answer

GLS and M3 Sedan are close on the comparable published fields, so buyer priorities should decide.

M3 Sedan starts ZAR 160,181 cheaper GLS from ZAR 2,350,181 · M3 Sedan from ZAR 2,190,000

Five key differences

Exact selected derivatives
Specification GLS M3 Sedan
Maximum Power GLS270 kW M3 Sedan390 kW
Maximum Torque GLS750 Nm M3 Sedan650 Nm @ 2750-5730 rpm
Engine Size GLS2989 cc M3 Sedan2993 cc
Combined Fuel Economy GLS12.3 km/l M3 Sedan12.5 km/l
Ground Clearance GLS215 mm M3 Sedan140 mm

Strongest published figure in that row; no road-test winner is implied.

Independent editorial assessment

Hagalu editorial ratings

When a variant is selected, its rating out of five applies only to that exact derivative; a model-range review is not inherited. Editorial ratings are separate from the Specification Evidence Index out of 100 and are not customer ratings.

Mercedes-Benz GLS

GLS 450 d

Hagalu editorial rating Not yet rated

No complete editorial rating is published for this exact variant. This is not a zero score.

How Hagalu rates cars

BMW M3 Sedan

M3 Competition Sedan with M xDrive

Hagalu editorial rating
3.9/5

Desk research · Exact variant

Hagalu Editorial Team ·

Editorial assessment, not a customer rating. Not road-tested for this review.

Read the review and score breakdown

Not yet rated means a complete review is not published; it does not mean the vehicle scored zero. Read the rating methodology.

What Each Car Gets Right (and Wrong)

Specification evidence leader

GLS

Strengths
  • Better fuel efficiency
  • Stronger listed safety equipment
  • Stronger published practicality figures
Weak Spots
  • Less powerful engine setup
Best suited to: Published Efficiency Published Practicality

M3 Sedan

Strengths
  • More powerful engine output
Weak Spots
  • Lower fuel efficiency
  • Fewer listed safety features
  • Lower published practicality figures
Best suited to: Published Performance

Which One's Right for You?

GLS

  • Buyers prioritising the lower published fuel or energy use
  • Buyers prioritising the more complete listed safety equipment
  • Buyers prioritising the stronger published space and capacity figures

M3 Sedan

  • Buyers prioritising the stronger published powertrain figures

Full Specs, Side by Side

Spec GLS M3 Sedan
Model Introduced Year 2026 2020
Generation Current South African GLS generation represented by derivative GLS 450 d G80 four-door BMW M performance sedan, separate from the regular 3 Series range and from the Touring body.
Facelift History Current-generation/facelift specification; derivative-specific South African configuration Current G80-generation South African M3 Competition Sedan in all-wheel-drive form.
Facelift Launched Since Current South African model cycle Original current-generation version
Facelift Version Ending Current Current
Body Style Suv Sedan
Model Year 2026 2026
Production Status Current South African retail range active
Segment Premium SUV Premium Sedan
Vehicle Type SUV Car
Spec GLS M3 Sedan
Length 5209 mm 4801 mm
Width 1956 mm 1903 mm
Height 1823 mm 1438 mm
Wheelbase 3135 mm 2857 mm
Ground Clearance (Default) 215 mm 140 mm
Ground Clearance (With Full Seating Load) 220 mm 125 mm
Fuel Tank Capacity 90 l 59 l
Boot/Cargo Space 355 l 480 l
Kerb Weight 2550 kg 1855 kg
Gross Vehicle Weight (GVW) 2000 kg 2260 kg
Payload Capacity 750 kg 480 kg
Towing Capacity 2000 kg 1600 kg
Seating Capacity 5 seats 5 seats
Number of Rows 2 rows 2 rows
Doors 5 doors 4 doors
Minimum Turning Radius 6.25 m 5.6 m
Front Headroom 960 mm 985 mm
Rear Headroom 960 mm 952 mm
Front Legroom 900 mm 1050 mm
Rear Legroom 900 mm 895 mm

In depth: how these cars differ

This GLS and M3 Sedan comparison uses the exact derivatives selected above for South Africa. The catalogue index covers performance, efficiency, safety equipment, practicality and ownership cover only where comparable source-backed fields are present.

Performance index: GLS 98 vs M3 Sedan 100.

Efficiency index: GLS 52 vs M3 Sedan 47.

Safety-equipment index: GLS 99 vs M3 Sedan 92.

Practicality index: GLS 67 vs M3 Sedan 60.

Ownership-cover index: GLS not separately scored vs M3 Sedan not separately scored.

These figures are Hagalu catalogue-comparison indicators, not customer ratings, crash-test scores, resale guarantees or a substitute for a road test. Each page shows its weighted source coverage beside the result.

Specification Evidence Index

A transparent comparison of published catalogue fields. This is not a road-test score, owner rating or editorial review rating, and it appears only when every vehicle clears the same comparable-data threshold.

Evidence / 100
Evidence-index readout

GLS leads by 4 points

GLS and M3 Sedan are close on the comparable published fields, so buyer priorities should decide.

Evidence leader 81 /100
Lead 4 points
Data 83% source coverage
81
#1 Evidence leader

GLS

83% source coverage 2 strong categories
Best at Safety 99 Check Efficiency 52
Performance 98
Efficiency 52
Safety 99
Practicality 67
Leads by 4 points
77
#2

M3 Sedan

83% source coverage 2 strong categories
Best at Performance 100 Check Efficiency 47
Performance 100
Efficiency 47
Safety 92
Practicality 60
Performance 24% Safety 22% Practicality 22% Efficiency 17% Ownership 15%
Category leaders What moves the verdict
Performance M3 Sedan +2 Efficiency GLS +5 Safety GLS +7 Practicality GLS +7

Close catalogue match. Buyer priorities should decide the outcome.

Why this score View full breakdown
Evidence-index leader

GLS

Performance 98/100
Efficiency 52/100
Safety 99/100
Practicality 67/100

M3 Sedan

Performance 100/100
Efficiency 47/100
Safety 92/100
Practicality 60/100

What the evidence means

Evidence index Mercedes-Benz GLS leads the specification evidence index with 81 pts vs 77 pts for M3 Sedan

In Hagalu's specification evidence index, GLS leads. However, M3 Sedan may suit buyers prioritising different confirmed fields. Ultimately, the right choice depends on your driving priorities in South Africa.

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GLS vs M3 Sedan questions

There is no universal winner. Use the comparison table to match the models and available derivatives in South Africa on price, safety equipment, space, powertrain and ownership cover. The category indicators summarise published catalogue data; they are not a road test or customer rating.

Compare the published consumption or mileage rows for the exact derivatives using the same unit and test basis. A catalogue figure is useful for like-for-like comparison, but traffic, speed, load, weather and driving style can change actual fuel use.

Compare only equipment explicitly listed for each derivative, including airbags, stability control and driver-assistance systems. Confirm the exact trim with the manufacturer, and treat any independent crash-test result separately because equipment and ratings can differ by market.

A reliable five-year total cannot be calculated from catalogue data alone. Add the exact purchase and finance cost, fuel or electricity, insurance quotes, scheduled servicing, tyres and expected resale value. Check whether the selected derivative includes a service or maintenance plan.

Use the seating, boot or load-space, ISOFIX and safety rows as a first check. Then test the exact cars with your child seats, passengers and typical luggage, because published dimensions do not show every access or comfort difference.

Compare the published power, torque and 0–100 km/h rows when they are available for both exact derivatives. Vehicle weight, gearing and power delivery also matter, so catalogue outputs alone do not establish real-world overtaking or response.