Mercedes-Benz SL-Class vs BMW XM
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.
Price Breakdown
The Mercedes-Benz SL-Class starts from $239,900 before on-road costs, while the BMW XM opens at $309,900. That makes the Mercedes-Benz SL-Class the more affordable entry point by $70,000.
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 $263,890 and $340,890 respectively.
The BMW XM qualifies for FBT exemption as an electric vehicle, which can dramatically reduce the effective cost for novated lease buyers. The Mercedes-Benz SL-Class, as a petrol model, does not qualify.
Over 5 years, the running costs favour the BMW XM by roughly $9,945 in fuel alone.
Safety Rundown
Both the Mercedes-Benz SL-Class and BMW XM hold a 5-star ANCAP safety rating.
Where the two diverge is in active safety technology. The BMW XM packs more ADAS features with 8 out of 10 key systems fitted, compared to 6 in the Mercedes-Benz SL-Class.
Both include the essentials: autonomous emergency braking, lane keep assist, adaptive cruise control, a reversing camera. Airbag count is 9 in the Mercedes-Benz SL-Class and 7 in the BMW XM. The BMW XM adds a 360-degree camera that the Mercedes-Benz SL-Class misses.
Feature Showdown
The Mercedes-Benz SL-Class features a 11.9-inch touchscreen, while the BMW XM gets a 14.9-inch display. 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 XM. The BMW XM counters with ventilated seats, power tailgate and Bowers & Wilkins audio. Which feature set matters more depends on your daily routine and priorities.
Drivetrain
The Mercedes-Benz SL-Class uses a Petrol producing 220kW and 400Nm of torque, sent through a automatic to a RWD layout. It covers the 0-100km/h sprint in 5.1 seconds.
The BMW XM responds with a Plug-in Hybrid making 550kW and 800Nm, paired to a auto driving all four wheels. It gets to 100km/h in 4.3 seconds.
The BMW XM has the clear power advantage at 550kW vs 220kW. In the real-world sprint, the BMW XM is 0.8s 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, 405mm shorter than the BMW XM at 5,110mm (3,105mm wheelbase). The longer wheelbase on the BMW XM generally means more rear legroom.
Boot space is 213L in the Mercedes-Benz SL-Class and 500L in the BMW XM, giving the BMW XM a 287L advantage. The BMW XM seats 5 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
True Cost to Own
Based on 15,000km of annual driving, fuel costs roughly $2,565/year for the Mercedes-Benz SL-Class and $576/year for the BMW XM. That is a $1,989 annual difference in favour of the BMW XM.
Estimated annual total: $2,565 (Mercedes-Benz SL-Class) vs $576 (BMW XM). The BMW XM saves you roughly $1,989 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 XM). Both match on warranty length.
Who Should Buy Which?
Buy the Mercedes-Benz SL-Class if: You want the lower entry price, or prefer Mercedes-Benz's approach to design and ownership experience.
Buy the BMW XM if: You prioritise performance, need more boot space, want lower running costs, or prefer BMW's approach to design and ownership experience.
The Verdict
The BMW XM takes 4 of 6 key spec categories. The BMW XM will save you roughly $1,989 a year in fuel. If boot space matters, the BMW XM 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 XM?
The Mercedes-Benz SL-Class is the cheapest at $239,900 before on-road costs. That undercuts the BMW XM by $70,000.
Which is the most fuel-efficient?
The Mercedes-Benz SL-Class uses the least fuel at 9L/100km on the combined cycle.
Which is safest?
They are evenly matched — Mercedes-Benz SL-Class and BMW XM all hold a 5-star ANCAP rating. Compare the active-safety features above to separate them.
Which has the most boot space?
The BMW XM has the largest boot at 500L.
Which can tow the most?
The BMW XM has the highest braked towing capacity at 2,700kg.
Which is the most powerful?
The BMW XM makes the most power at 550kW. The BMW XM is quickest to 100km/h in 4.3s.
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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