Mercedes-Benz SL-Class vs BMW M8
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.
Mercedes-Benz SL-Class
From $386,500
Convertible
Petrol
Petrol
430kW
13.9 L/100km
ANCAP: no data
213L
BMW M8
From $377,000
Gran Coupe
Petrol
Petrol
460kW
10.7 L/100km
ANCAP: no data
440L
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Price Breakdown
The Mercedes-Benz SL-Class starts from $386,500 before on-road costs, while the BMW M8 opens at $377,000. That makes the BMW M8 the more affordable entry point by $9,500.
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 $425,150 and $414,700 respectively.
Over 5 years, the running costs favour the BMW M8 by roughly $4,560 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 Mercedes-Benz SL-Class features a 11.9-inch touchscreen paired with a 12.3-inch digital dash, while the BMW M8 gets a 10.3-inch display and 12.3-inch instruments. Apple CarPlay and Android Auto are standard across both.
The Mercedes-Benz SL-Class stands out with Burmester audio that you will not find on the BMW M8. The BMW M8 counters with ventilated seats, power tailgate and Bowers & Wilkins audio. Which feature set matters more depends on your daily routine and priorities.
Interior trim differs: the Mercedes-Benz SL-Class gets nappa leather upholstery while the BMW M8 offers merino leather.
Drivetrain
The Mercedes-Benz SL-Class uses a Petrol producing 430kW and 800Nm of torque, sent through a automatic to a AWD layout. It covers the 0-100km/h sprint in 3.9 seconds.
The BMW M8 responds with a Petrol making 460kW and 750Nm, paired to a auto driving all four wheels. It gets to 100km/h in 3.2 seconds.
The BMW M8 has the clear power advantage at 460kW vs 430kW. In the real-world sprint, the BMW M8 is 0.7s quicker. For most buyers, the way each car feels day-to-day matters more than outright acceleration.
Space & Comfort
The Mercedes-Benz SL-Class measures 4,705mm long on a 2,700mm wheelbase, 393mm shorter than the BMW M8 at 5,098mm (3,027mm wheelbase). The longer wheelbase on the BMW M8 generally means more rear legroom.
Boot space is 213L in the Mercedes-Benz SL-Class and 440L in the BMW M8, giving the BMW M8 a 227L advantage. The BMW M8 seats 4 vs 2.
0Turning Circle
Kerb-to-kerb diameter. Smaller turns easier in tight carparks and U-turns.
11.4m to 11.6m
Based on 11.6m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Based on 11.4m 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 $3,962/year for the Mercedes-Benz SL-Class and $3,050/year for the BMW M8. That is a $912 annual difference in favour of the BMW M8.
Estimated annual total: $3,962 (Mercedes-Benz SL-Class) vs $3,050 (BMW M8). The BMW M8 saves you roughly $912 per year in total ownership costs. Use our Fuel Cost Calculator to estimate based on your driving.
Warranty: 5 years / 999,999km (Mercedes-Benz SL-Class) vs 5 years / 999,999km (BMW M8). Both match on warranty length.
Who Should Buy Which?
Buy the Mercedes-Benz SL-Class if: You or prefer Mercedes-Benz's approach to design and ownership experience.
Buy the BMW M8 if: You want the lower entry price, prioritise performance, need more boot space, want lower running costs, or prefer BMW's approach to design and ownership experience.
The Verdict
The BMW M8 takes 5 of 5 key spec categories and comes in at a lower price. The BMW M8 will save you roughly $912 a year in fuel. If boot space matters, the BMW M8 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, Mercedes-Benz SL-Class and BMW M8?
The BMW M8 is the cheapest at $377,000 before on-road costs. That undercuts the Mercedes-Benz SL-Class by $9,500.
Which is the most fuel-efficient?
The BMW M8 uses the least fuel at 10.7L/100km on the combined cycle.
What are the ANCAP safety ratings?
None of Mercedes-Benz SL-Class and BMW M8 carry a published ANCAP rating yet — check back as they are tested.
Which has the most boot space?
The BMW M8 has the largest boot at 440L.
Which is the most powerful?
The BMW M8 makes the most power at 460kW. The BMW M8 is quickest to 100km/h in 3.2s.
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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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