BMW XM vs Mercedes-Benz SL-Class
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 XM
From $309,900
SUV
Plug-in Hybrid
Plug-in Hybrid
550kW
2.7 kWh/100km
ANCAP: no data
527L
Mercedes-Benz SL-Class
From $239,900
Convertible
Petrol
Petrol
280kW
9 L/100km
5★ ANCAP
213L
Plug-in hybrid fuel economy is shown as a hybrid (battery depleted) so it compares fairly with the other car. A PHEV's official "combined" figure assumes you start every trip fully charged, so real-world economy depends on how often you plug in. Electric range shows how far it goes before the petrol engine is needed.
Track the BMW XM & Mercedes-Benz SL-Class
Get price-drop alerts on these models plus our free weekly new-car rundown. Unsubscribe anytime.
Price Breakdown
The BMW XM starts from $309,900 before on-road costs, while the Mercedes-Benz SL-Class opens at $239,900. 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 $340,890 and $263,890 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 $9,755 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.
Charging Times
How long each takes to charge — from a household power point to ultra-rapid DC — estimated from battery size and max charge rates.
How long to charge
25.7kWh usableEstimates from usable battery size and the car's max charge rates (7.4kW AC). Real times vary with temperature, starting charge, charger output and the charging curve.
Feature Showdown
The BMW XM features a 14.9-inch touchscreen paired with a 12.3-inch digital dash, while the Mercedes-Benz SL-Class gets a 11.9-inch display and 12.3-inch instruments. Apple CarPlay and Android Auto are standard across both.
The BMW XM stands out with ventilated seats, power tailgate and Bowers & Wilkins audio that you will not find on the Mercedes-Benz SL-Class. The Mercedes-Benz SL-Class counters with Burmester audio. Which feature set matters more depends on your daily routine and priorities.
Interior trim differs: the BMW XM gets merino leather upholstery while the Mercedes-Benz SL-Class offers nappa leather. Climate control is 4-zone in the BMW XM and 2-zone in the Mercedes-Benz SL-Class.
Drivetrain
The BMW XM uses a Plug-in Hybrid producing 550kW and 1000Nm of torque, sent through a auto to a AWD layout. It covers the 0-100km/h sprint in 3.8 seconds.
The Mercedes-Benz SL-Class responds with a Petrol making 280kW and 480Nm, paired to a automatic driving the rear wheels. It gets to 100km/h in 4.9 seconds.
The BMW XM has the clear power advantage at 550kW vs 280kW. In the real-world sprint, the BMW XM is 1.1s quicker. For most buyers, the way each car feels day-to-day matters more than outright acceleration.
Space & Comfort
The BMW XM measures 5,110mm long on a 3,105mm wheelbase, 405mm longer than the Mercedes-Benz SL-Class at 4,705mm (2,700mm wheelbase). The longer wheelbase on the BMW XM generally means more rear legroom.
Boot space is 527L in the BMW XM and 213L in the Mercedes-Benz SL-Class, giving the BMW XM a 314L 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 11.4m 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 $614/year for the BMW XM and $2,565/year for the Mercedes-Benz SL-Class. That is a $1,951 annual difference in favour of the BMW XM.
Estimated annual total: $614 (BMW XM) vs $2,565 (Mercedes-Benz SL-Class). The BMW XM saves you roughly $1,951 per year in total ownership costs. Use our Fuel Cost Calculator to estimate based on your driving.
Warranty: 5 years / 999,999km (BMW XM) vs 5 years / 999,999km (Mercedes-Benz SL-Class). Both match on warranty length.
Who Should Buy Which?
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.
Buy the Mercedes-Benz SL-Class if: You want the lower entry price, or prefer Mercedes-Benz'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 $1,951 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, BMW XM and Mercedes-Benz SL-Class?
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 BMW XM uses the least fuel at 2.7L/100km on the combined cycle.
Which is safest?
They are evenly matched — Mercedes-Benz SL-Class 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 527L.
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 3.8s.
Track the cars you're comparing
Sign up free for price-drop alerts on the models in this comparison, plus our weekly new-car rundown covering launches, deals and reviews. No spam, unsubscribe anytime.
By subscribing, you agree to receive marketing emails. You can unsubscribe at any time. View our Privacy Policy.
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
Comments (0)
Sign in to join the conversation
No comments yet. Be the first!
