Comparison Mercedes-Benz SL Roadster (W198 II) 300 SL (215 Hp) & Audi S4 Avant (B8, facelift 2011) 3.0 TFSI V6 (333 Hp) quattro S tronic & Audi A4 (B6 8E) 1.8 T (163 Hp) Multitronic
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| Brand: | Mercedes-Benz | Audi | Audi |
| Model: | SL | S4 | A4 |
| Generation: | SL Roadster (W198 II) | S4 Avant (B8, facelift 2011) | A4 (B6 8E) |
| Engine / modification: | 300 SL (215 Hp) | 3.0 TFSI V6 (333 Hp) quattro S tronic | 1.8 T (163 Hp) Multitronic |
| Production start: | 1957 year | 2011 year | 2002 year |
| Production end: | 1963 year | 2016 year | 2004 year |
| Coupe type: | Roadster | Combi | Sedan |
| Num. of Doors: | 2 | 5 | 4 |
| Num. of seats: | 2 | 5 | 5 |
| Fuel consumption / economy - urban: | 11.2 l/100 km | 11.3 l/100 km | |
| Fuel consumption / economy - extra urban: | 6.8 l/100 km | 6.4 l/100 km | |
| Fuel consumption / economy - combined: | 12.5 l/100 km | 8.4 l/100 km | 8.2 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.33 | 0.30 | |
| Fuel tank volume: | 100 l | 61 l | 70 l |
| Emission standard: | Euro 5 | ||
| CO2 emissions: | 197 g/km | ||
| Power: | 215 hp | 333 hp | 163 hp |
| Max power in: | 5800 rpm. | 5500-6500 rpm. | 5700 rpm. |
| Maximum speed: | 250 km/h | 250 km/h | 223 km/h |
| Acceleration from 0 to 100 km/h: | 10 sec | 5.1 sec | 8.6 sec |
| Torque: | 275 Nm @ 4600 rpm. | 440 Nm @ 2900-5300 rpm. | 225 Nm @ 1950-4700 rpm. |
| Model Engine: | M 198 I/198.980, M 198 III/198.982 | CGWC, CGXC, CTDA, CTUB, CREC | BFB |
| Engine position: | Front, longitudinal | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 2996 cm3 | 2995 cm3 | 1781 cm3 |
| Engine oil capacity: | 11 l | 6.8 l | 4.1 l |
| Coolant: | 15.5 l | 8 l | |
| Fuel System: | Direct injection | Direct injection | Multi-point injection |
| Aspiration / Turbine: | Mechanical supercharging (Compressor) | Turbocharging | |
| Position of cylinders: | Inline | V engine | Inline |
| Valvetrain: | SOHC | DOHC | DOHC |
| Number of cylinders: | 6 | 6 | 4 |
| Number of valves per cylinder: | 2 | 4 | 5 |
| Compression ratio: | 8.55 | 10.3 | 9.3 |
| Piston Stroke: | 88 mm | 89 mm | 86.4 mm |
| Cylinder Bore: | 85 mm | 84.5 mm | 81 mm |
| Wheel Drive: | Rear wheel drive | All wheel drive (4x4) | Front wheel drive |
| Number of Gears (automatic transmission): | 7 S tronic | Multitronic | |
| Number of Gears (manual transmission): | 4 | ||
| Length: | 4570 mm | 4719 mm | 4548 mm |
| Width: | 1790 mm | 1826 mm | 1772 mm |
| Width including mirrors: | 2040 mm | ||
| Height: | 1300 mm | 1415 mm | 1428 mm |
| Wheelbase: | 2400 mm | 2811 mm | 2650 mm |
| Front track: | 1398 mm | 1552 mm | 1528 mm |
| Rear (Back) track: | 1448 mm | 1539 mm | 1526 mm |
| Ride height(clearance): | 130 mm | ||
| Front overhang: | 868 mm | ||
| Rear overhang: | 1040 mm | ||
| Minimum volume of Luggage (trunk): | 490 l | 445 l | |
| Maximum amount of Luggage (trunk): | 1430 l | 720 l | |
| Front suspension: | Multi-link suspension | Independent multi-link | |
| Rear suspension: | Helical spring | Independent on trapezoidal lever | Multi-link independent |
| Max weight: | 1660 kg | 2320 kg | 1970 kg |
| Front brakes: | Drum | Ventilated discs | Ventilated discs |
| Rear brakes: | Drum | Ventilated discs | Disc |
| Kerb Weight: | 1330 kg | 1750 kg | 1420 kg |
| ABS: | yes | yes | |
| Steering type: | Cone worm with recirculation balls | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | ||
| Max. roof load: | 90 kg | ||
| Permitted trailer load with brakes (8%): | 2100 kg | ||
| Minimum turning circle (turning diameter): | 11.5 m | 11.5 m | 11.1 m |
| Permitted trailer load with brakes (12%): | 1900 kg | ||
| Permitted trailer load without brakes: | 750 kg | ||
| Permitted towbar download: | 80 kg | ||
| Tire size: | 165/90 R 15 | 245/40 R18 | 205/55 R16 |
| Wheel rims size: | 5.5 K x 15 | 8J x 18 | 7J x 16 |