BMW Z4 vs Mercedes-Benz GLB
A detailed look at how two of Australia's most popular cars compare on price, running costs, safety, and everyday livability.
Specifications and pricing correct at time of publishing. Prices are RRP before on-road costs unless stated otherwise. Always confirm with the manufacturer or dealer before purchasing.
BMW Z4
From $99,200
Convertible
Petrol
Petrol
145kW
6.5 L/100km
ANCAP: no data
281L
Mercedes-Benz GLB
From $63,900
SUV
Petrol
Petrol
120kW
7.5 L/100km
ANCAP: no data
570L
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Price Breakdown
The BMW Z4 starts from $99,200 before on-road costs, while the Mercedes-Benz GLB opens at $63,900. That makes the Mercedes-Benz GLB the more affordable entry point by $35,300.
Once you factor in stamp duty, registration, CTP insurance, and dealer delivery, expect to add roughly 8-12% on top of the RRP depending on your state. That puts estimated driveaway prices in the ballpark of $109,120 and $70,290 respectively.
Over 5 years, the running costs favour the BMW Z4 by roughly $1,425 in fuel alone.
Safety Rundown
ANCAP safety ratings have not been published for both models yet. We will update this section when crash test results are available.
Feature Showdown
The BMW Z4 features a 10.3-inch touchscreen paired with a 12.3-inch digital dash, while the Mercedes-Benz GLB gets a 10.3-inch display and 10.3-inch instruments. Apple CarPlay and Android Auto are standard across both.
The Mercedes-Benz GLB counters with wireless charging, heated front seats, power tailgate and ambient lighting that the BMW Z4 does not offer. Which feature set matters more depends on your daily routine and priorities.
Interior trim differs: the BMW Z4 gets vernasca leather upholstery while the Mercedes-Benz GLB offers synthetic leather.
Drivetrain
The BMW Z4 uses a Petrol producing 145kW and 320Nm of torque, sent through a auto to a RWD layout. It covers the 0-100km/h sprint in 6.6 seconds.
The Mercedes-Benz GLB responds with a Petrol making 120kW and 270Nm, paired to a automatic driving the front wheels. It gets to 100km/h in 9.4 seconds.
The BMW Z4 has the clear power advantage at 145kW vs 120kW. In the real-world sprint, the BMW Z4 is 2.8s quicker. For most buyers, the way each car feels day-to-day matters more than outright acceleration.
Space & Comfort
The BMW Z4 measures 4,324mm long on a 2,470mm wheelbase, 310mm shorter than the Mercedes-Benz GLB at 4,634mm (2,829mm wheelbase). The longer wheelbase on the Mercedes-Benz GLB generally means more rear legroom.
Boot space is 281L in the BMW Z4 and 570L in the Mercedes-Benz GLB, giving the Mercedes-Benz GLB a 289L advantage. The Mercedes-Benz GLB seats 7 vs 2.
0Turning Circle
Kerb-to-kerb diameter. Smaller turns easier in tight carparks and U-turns.
11.0m to 11.6m
Based on 11.0m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Based on 11.6m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Turning circle ratings
Compare U-turns side by side
Turning Circle · U-turn compare
kerb-to-kerb, 2 cars0 of 2 clear a 7.0 m street in one sweep
Green cars complete the U-turn; amber need a 3-point turn. Drag the slider to test tighter streets.
Standard widths: AU local streets ~5.5–7 m; main roads ~9–12 m.
True Cost to Own
Based on 15,000km of annual driving, fuel costs roughly $1,853/year for the BMW Z4 and $2,138/year for the Mercedes-Benz GLB. That is a $285 annual difference in favour of the BMW Z4.
Estimated annual total: $1,853 (BMW Z4) vs $2,138 (Mercedes-Benz GLB). The BMW Z4 saves you roughly $285 per year in total ownership costs. Use our Fuel Cost Calculator to estimate based on your driving.
Warranty: 5 years / 999,999km (BMW Z4) vs 5 years / 999,999km (Mercedes-Benz GLB). Both match on warranty length.
Who Should Buy Which?
Buy the BMW Z4 if: You prioritise performance, want lower running costs, or prefer BMW's approach to design and ownership experience.
Buy the Mercedes-Benz GLB if: You want the lower entry price, need more boot space, or prefer Mercedes-Benz's approach to design and ownership experience.
The Verdict
This is genuinely close. The BMW Z4 and Mercedes-Benz GLB trade blows across the spec sheet, and neither runs away with an outright win. The BMW Z4 will save you roughly $285 a year in fuel. If boot space matters, the Mercedes-Benz GLB has a clear edge. The best pick depends on what you value most. Explore the full specs for each model below.
Common questions
Which is cheapest, BMW Z4 and Mercedes-Benz GLB?
The Mercedes-Benz GLB is the cheapest at $63,900 before on-road costs. That undercuts the BMW Z4 by $35,300.
Which is the most fuel-efficient?
The BMW Z4 uses the least fuel at 6.5L/100km on the combined cycle.
What are the ANCAP safety ratings?
None of BMW Z4 and Mercedes-Benz GLB carry a published ANCAP rating yet — check back as they are tested.
Which has the most boot space?
The Mercedes-Benz GLB has the largest boot at 570L.
Which can tow the most?
The Mercedes-Benz GLB has the highest braked towing capacity at 1,600kg.
Which is the most powerful?
The BMW Z4 makes the most power at 145kW. The BMW Z4 is quickest to 100km/h in 6.6s.
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Disclaimer: All information in this comparison was believed to be correct at the time of publishing (20 April 2026). Prices are manufacturer recommended retail prices (RRP) and may vary by state, dealer, and options. Driveaway costs include estimated on-road costs for Victoria. Fuel economy figures are WLTP/ADR combined cycle. Specifications can change without notice. Always verify with the manufacturer before making a purchase decision. CarSorted does not accept payment for recommendations.
Auto-generated from CarSorted's specification data · 20 April 2026
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