2018 Mercedes-Benz SL 450 Overview, Reviews, Ratings & Specs
The 2018 Mercedes-Benz SL 450 is a luxury convertible that traces its lineage back to the iconic 300SL Gullwing. Part of the R231 generation, it embodies a blend of performance and opulent comfort. The SL 450 is the entry-level model for the 2018 SL lineup, typically offered as a single, well-equipped trim. Its enduring popularity stems from its sophisticated styling, powerful yet refined driving dynamics, and the prestigious Mercedes-Benz badge, offering a compelling grand touring experience for those seeking a high-end drop-top.
The Good
The SL 450 excels with its potent V6 engine offering brisk acceleration, a supremely comfortable and quiet cabin, and striking, timeless design. Its retractable hardtop provides coupe-like security and convertible freedom. For practical buyers, Mercedes-Benz reliability is a plus, while emotional appeal comes from the luxurious interior and exhilarating driving experience.
The Bad
Potential buyers should be aware of the SL 450's high purchase price and ongoing maintenance costs, which are typical for a luxury German convertible. Some reviewers note that while comfortable, its handling may not be as sharp as sportier rivals, and rear-seat space is virtually nonexistent.
2018 Mercedes-Benz SL 450: Quick Overview
- Engine Options: The 2018 Mercedes-Benz SL 450 is powered by a 3.0-liter twin-turbocharged V6 engine.
- Horsepower: This V6 engine produces 362 horsepower.
- Torque: It generates 369 lb-ft of torque.
- Transmission: Mated to a 9-speed automatic transmission with paddle shifters.
- Drivetrain: Rear-wheel drive is standard.
- Fuel Economy (EPA Estimated): The SL 450 achieves an estimated 20 MPG city and 28 MPG highway, for a combined 23 MPG.
- 0-60 MPH Times: Acceleration from 0 to 60 mph is typically around 4.8 to 4.9 seconds, depending on conditions and driver input.
- Towing Capacity: The SL 450 is not designed for towing, and a towing capacity is not specified.
- Trim-Level Features (SL 450):
- Retractable hardtop with panoramic glass roof and MAGIC SKY Control (electrically dimmable glass)
- Nappa leather upholstery
- Heated and ventilated power-adjustable front seats with memory
- AIRSCARF® neck-level heating system
- COMAND® infotainment system with navigation and an 8-inch display
- Burmester® surround sound system
- KEYLESS GO®
- LED lighting (headlights, taillights)
- Active Brake Assist
- ATTENTION ASSIST®
- PARKTRONIC with parking guidance
- 19-inch alloy wheels
- Adaptive damping suspension
- Dual-zone automatic climate control
- SiriusXM® Satellite Radio
- Bluetooth® connectivity
- Smartphone integration (Apple CarPlay, Android Auto) may be optional or standard depending on specific package
- Ambient interior lighting
2018 Mercedes-Benz SL 450 Specifications
Vehicle Information
| Year | 2018 |
| Make | Mercedes-Benz |
| Model | SL 450 |
| Trim | - |
| Style | Convertible |
| Type | Convertible |
| Category | Sports Car |
Manufacturing Details
| Made In | Germany |
| Manufacturing City | BREMEN |
Dimensions
| Doors | 2-Door |
| Curb Weight | 3826 pounds |
| Gross Vehicle Weight Rating | - |
| Overall Height | 51.20 inches |
| Overall Length | 182.30 inches |
| Overall Width | 76.70 inches |
| Wheelbase Length | 101.70 inches |
| Standard Seating | 2 |
Engine & Performance
| Engine | 3.0-L V-6 DOHC 24V |
| Engine Size | 3L |
| Engine Cylinders | 6 |
| Transmission | 9-Speed Automatic |
| Transmission Type | Automatic |
| Transmission Speeds | 9-Speed |
| Drivetrain | Rear-Wheel Drive |
Additional Features
| Anti-Brake System | 4-Wheel ABS |
| Steering Type | Rack & Pinion |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | $88,200 |
| Invoice Price | $82,026 |
| Delivery Charges | $995 |
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What Problems Does the 2018 Mercedes-Benz SL 450 Have?
The 2018 Mercedes-Benz SL 450, being part of a mature platform, generally exhibits good reliability for a luxury vehicle of its class and age. However, like many complex modern automobiles, some owners have reported specific issues. One of the more commonly cited concerns relates to the convertible hardtop mechanism. While generally robust, potential buyers should ensure it operates smoothly without any binding or unusual noises. Issues with sensors or hydraulic components within the roof system can be costly to repair if they arise. Another area to monitor is the infotainment system, particularly the COMAND interface. While sophisticated, occasional glitches or software freezes have been noted by some users, though these are often resolvable with software updates. Electrical gremlins are also a possibility in any high-tech vehicle, and while not prevalent, issues with various electronic modules or sensors could surface over time. For the 2018 model year specifically, there were a few recalls issued. These typically addressed safety-related items. For instance, some vehicles might have had recalls concerning the occupant restraint system (airbags) or potential issues with the fuel system. It is crucial for prospective buyers to check the vehicle's VIN against NHTSA (National Highway Traffic Safety Administration) records or the manufacturer's website to ensure all outstanding recalls have been performed. In terms of long-term reliability, the powertrain (engine and transmission) is generally considered durable, especially with diligent adherence to the recommended maintenance schedule. The V6 engine and 9-speed automatic transmission have proven themselves over several model years. However, the cost of out-of-warranty repairs on specialized components like the adaptive suspension, active cooling systems, or advanced electronic control units can be significant, which is a common characteristic of high-end German luxury cars. Owners who have consistently followed the manufacturer's maintenance plan, including regular fluid changes and inspections, tend to report fewer significant issues over the years.
How long will the 2018 Mercedes-Benz SL 450 last?
Based on owner data and typical usage patterns for a luxury grand tourer, a 2018 Mercedes-Benz SL 450 can reasonably be expected to provide reliable service for 150,000 to 200,000 miles, provided it receives consistent and meticulous maintenance. The core mechanical components, like the twin-turbo V6 engine and 9-speed automatic transmission, are engineered for longevity and can withstand high mileage if cared for properly. However, as the vehicle ages and mileage increases, owners may encounter more frequent repairs related to its complex systems. The retractable hardtop mechanism, advanced suspension components, and the multitude of electronic control units are prime candidates for potential wear and tear over time. While the powertrain exhibits strong long-term durability, the intricate electronic and mechanical systems associated with a luxury convertible represent potential weaknesses that can lead to more costly repairs as the car surpasses the 100,000-mile mark.
What Technology & Safety Features are Included?
The 2018 Mercedes-Benz SL 450 is equipped with a sophisticated suite of technology, entertainment, and safety features befitting its luxury status. Standard technology includes the COMAND infotainment system, featuring a 8-inch high-resolution color display that controls navigation, audio, climate, and vehicle settings. For audio enthusiasts, a high-quality Burmester surround sound system is usually standard, offering an immersive listening experience. Smartphone integration, typically via Apple CarPlay and Android Auto, is available, allowing seamless connectivity for music, calls, and apps. The vehicle also comes with Bluetooth connectivity for hands-free calling and audio streaming. Ambient interior lighting allows for personalization of the cabin's atmosphere.
In terms of driver-assistance and safety, the SL 450 is well-appointed. Standard safety features include Active Brake Assist, which can automatically apply braking to help mitigate or avoid collisions, and ATTENTION ASSIST®, which monitors the driver for signs of fatigue and suggests taking a break. It also features standard airbags, anti-lock brakes, stability and traction control. The PARKTRONIC system with parking guidance aids in low-speed maneuvers. Optional features often enhance the driving experience and safety further. These can include adaptive cruise control (DISTRONIC PLUS), active lane keeping assist, blind spot assist, and a rearview camera or 360-degree camera system for improved visibility. The robust construction, including a high-strength aluminum body, contributes to its inherent safety. While specific crash-test ratings for the 2018 SL 450 from agencies like the IIHS (Insurance Institute for Highway Safety) or NHTSA are not as extensively documented as for more mainstream models, Mercedes-Benz vehicles typically perform well in impact tests due to their advanced safety engineering and structural integrity.
In terms of driver-assistance and safety, the SL 450 is well-appointed. Standard safety features include Active Brake Assist, which can automatically apply braking to help mitigate or avoid collisions, and ATTENTION ASSIST®, which monitors the driver for signs of fatigue and suggests taking a break. It also features standard airbags, anti-lock brakes, stability and traction control. The PARKTRONIC system with parking guidance aids in low-speed maneuvers. Optional features often enhance the driving experience and safety further. These can include adaptive cruise control (DISTRONIC PLUS), active lane keeping assist, blind spot assist, and a rearview camera or 360-degree camera system for improved visibility. The robust construction, including a high-strength aluminum body, contributes to its inherent safety. While specific crash-test ratings for the 2018 SL 450 from agencies like the IIHS (Insurance Institute for Highway Safety) or NHTSA are not as extensively documented as for more mainstream models, Mercedes-Benz vehicles typically perform well in impact tests due to their advanced safety engineering and structural integrity.
What Colors Options are Available?
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2018 Mercedes-Benz SL 450 Prices and Market Value
When new, the 2018 Mercedes-Benz SL 450 had an original MSRP typically starting in the low $90,000s, with options easily pushing the price upwards of $100,000. Currently, the used market price for a 2018 SL 450 generally ranges from approximately $45,000 to $65,000, depending heavily on mileage, condition, and specific options. Depreciation on luxury vehicles like the SL is generally steeper in the initial years. However, the SL 450 tends to hold its value better than some other luxury cars due to its iconic status, enduring design, and the prestige of the Mercedes-Benz brand. Factors significantly affecting resale value include the car's maintenance history, the presence of desirable optional packages, low mileage, and overall cosmetic and mechanical condition. A well-maintained SL 450 with desirable features will command a higher price on the pre-owned market.
2018 Mercedes-Benz SL 450 Cost of Ownership
The 2018 Mercedes-Benz SL 450 is a costly vehicle to own. Insurance premiums will be significantly higher than for average vehicles due to its luxury status, performance, and high replacement cost. Fuel costs will be moderate to high, with its V6 engine delivering decent highway MPG but consuming more in city driving, requiring premium unleaded gasoline. Maintenance costs are substantial; expect regular dealer servicing, fluid changes, and tire replacements to be expensive. Repair costs can be exceptionally high for specialized components or if issues arise with the complex convertible roof or electronic systems. Overall, the SL 450 is definitively not an economical car to own, demanding a significant budget for ongoing expenses.
2018 Mercedes-Benz SL 450 Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
19.80 gallons
City Mileage
20 miles/gallon
Highway Mileage
28 miles/gallon
2018 Mercedes-Benz SL 450 Warranty
Basic
Original warranty
48 months / 50,000 miles
Estimated remaining
Expired
Powertrain
Original warranty
48 months / 50,000 miles
Estimated remaining
Expired
Rust
Original warranty
48 months / 50,000 miles
Estimated remaining
Expired
2018 Mercedes-Benz SL 450 Insurance
Insurance for a 2018 Mercedes-Benz SL 450 is moderately priced, reflecting its status as a Convertible with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2018 Mercedes-Benz SL 450 Compare to Other Convertible?
The 2018 Mercedes-Benz SL 450 competes in the high-end luxury convertible segment, with key rivals including the Porsche 911 Carrera Convertible, BMW 6 Series Convertible (though phasing out in 2018 for the 8 Series), and potentially the Jaguar F-TYPE Convertible. In terms of performance, the SL 450's 362-horsepower V6 offers strong, smooth acceleration suitable for grand touring, but it might not match the raw sportiness of a Porsche 911 or the agility of a Jaguar F-TYPE. The 911, in particular, offers superior handling dynamics and a more driver-focused experience, though at a higher price point. The BMW 6 Series provided a luxurious and powerful alternative, offering similar comfort and performance, though often with a slightly less striking design than the SL. The Jaguar F-TYPE often appeals with its bold styling and more visceral exhaust note, offering a sportier feel than the SL 450. Feature-wise, the SL 450 is exceptionally well-equipped, boasting a plush interior, advanced technology, and the signature Mercedes-Benz comfort features like AIRSCARF. Its retractable hardtop offers versatility. Reliability for the SL 450 is generally good for its class, often perceived as more dependable than some European rivals, especially with diligent maintenance. However, repair costs can be high across all these luxury marques. Price-wise, the SL 450 typically sat in the mid-to-upper range of this segment when new and offers a competitive used market value compared to a similarly equipped Porsche 911. If seeking a more focused sports car experience, a used Porsche 911 Carrera Convertible or a Jaguar F-TYPE R (if budget allows) would be strong contenders. If pure luxury and comfortable cruising are paramount, the SL 450 remains an excellent choice. A similarly aged BMW 6 Series Convertible would be a comparable alternative, often offering a slightly different design aesthetic and driving feel.
Final Verdict: Is the 2018 Mercedes-Benz SL 450 a Good Convertible?
The 2018 Mercedes-Benz SL 450 is ideal for discerning buyers seeking a sophisticated and comfortable grand touring convertible. It's perfect for those who prioritize luxurious amenities, a smooth ride, and the prestige of a Mercedes-Benz, rather than outright sports car performance. While new, it represented a significant investment. Buying used is where it offers considerable value, as its initial depreciation makes it more accessible. It is absolutely worth buying for individuals who appreciate its timeless design, powerful yet refined V6 engine, and the flexibility of its retractable hardtop. For optimal value, look for a well-maintained pre-owned model with lower mileage and desirable optional features, ensuring all maintenance records are available. It's a compelling choice for those seeking an elegant drop-top experience without compromising on comfort.
Simon A
Simon is a contributor to VinCheck, where he provides articles and reviews on various automotive topics. His work focuses on delivering accurate and up-to-date information about used cars, helping readers make informed decisions.