Mercedes-Benz SL-Class vs Porsche 911
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 Porsche 911 opens at $248,400. That makes the Mercedes-Benz SL-Class the more affordable entry point by $8,500.
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 $263,890 and $273,240 respectively.
Over 5 years, the running costs favour the Mercedes-Benz SL-Class by roughly $2,995 in fuel alone.
Safety Rundown
Both the Mercedes-Benz SL-Class and Porsche 911 hold a 5-star ANCAP safety rating.
Where the two diverge is in active safety technology. The Mercedes-Benz SL-Class packs more ADAS features with 6 out of 10 key systems fitted, compared to 0 in the Porsche 911.
Both include the essentials: a reversing camera.
Feature Showdown
Both come with modern infotainment systems.
The Mercedes-Benz SL-Class stands out with wireless Apple CarPlay/Android Auto, head-up display, wireless charging, panoramic roof, heated front seats, Burmester audio and ambient lighting that you will not find on the Porsche 911. 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 Porsche 911 responds with a Petrol making 290kW and 450Nm, paired to a 8-speed pdk driving the rear wheels. It gets to 100km/h in 4.1 seconds.
The Porsche 911 has the clear power advantage at 290kW vs 220kW. In the real-world sprint, the Porsche 911 is 1.0s 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, 172mm longer than the Porsche 911 at 4,533mm (2,450mm wheelbase). The longer wheelbase on the Mercedes-Benz SL-Class generally means more rear legroom.
Boot space is 213L in the Mercedes-Benz SL-Class and 132L in the Porsche 911, giving the Mercedes-Benz SL-Class a 81L advantage. The Porsche 911 seats 4 vs 2.
0Turning Circle
Kerb-to-kerb diameter. Smaller turns easier in tight carparks and U-turns.
11.6m diameter
Average
Based on 11.6m 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 $3,164/year for the Porsche 911. That is a $599 annual difference in favour of the Mercedes-Benz SL-Class.
Estimated annual total: $2,565 (Mercedes-Benz SL-Class) vs $3,164 (Porsche 911). The Mercedes-Benz SL-Class saves you roughly $599 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 3 years / 999,999km (Porsche 911). The Mercedes-Benz SL-Class has longer coverage.
Who Should Buy Which?
Buy the Mercedes-Benz SL-Class if: You want the lower entry price, need more boot space, want lower running costs, value a longer warranty, or prefer Mercedes-Benz's approach to design and ownership experience.
Buy the Porsche 911 if: You prioritise performance, or prefer Porsche's approach to design and ownership experience.
The Verdict
The Mercedes-Benz SL-Class takes 4 of 6 key spec categories and comes in at a lower price. The Mercedes-Benz SL-Class will save you roughly $599 a year in fuel. If boot space matters, the Mercedes-Benz SL-Class has a clear edge. The Mercedes-Benz SL-Class adds peace of mind with a longer 5-year warranty. The best pick depends on what you value most. Explore the full specs for each model below.
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.
Published by CarSorted Editorial Team · 20 April 2026
Comments (0)
Sign in to join the conversation
No comments yet. Be the first!
