2017 Mercedes-Benz SL-Class Reviews, Pricing & Specs
Write a reviewOur experts haven't test driven this car yet.
Our experts haven't test driven this car yet.
Our experts haven't test driven this car yet.
Our experts haven't test driven this car yet.
Our experts haven't test driven this car yet.
Our experts haven't test driven this car yet.
User reviews for 2017 Mercedes-Benz SL-Class
Write a reviewWhat users have asked
2017 Mercedes-Benz SL-Class Pricing
Trims & specs
Air Conditioning
Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Dual front knee airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags
Audio System
Antenna Type: diversity · Voice recognition audio system · Bluetooth auxiliary audio input · 6 disc in-dash CD · MP3 player: CD MP3 Playback · Premium Brand: Harman-Kardon · HD radio · Satellite Radio: SiriusXM · 2 subwoofers · Surround audio: 5.1 · Total Number of Speakers: 9 · 600 watts
Brakes
ABS: 4-wheel · Braking assist: hill start assist · Front brake diameter: 14.2 · Front brakes: ventilated disc · Rear brake diameter: 12.6 · Rear brakes: ventilated disc
Comfort Features
Armrests: front center · Center console trim: aluminium · Door trim: aluminum · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: aluminum · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Ambient lighting: color-adjustable · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: side mirrors · Multi-function remote: keyless entry with panic alarm · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: power tilt and telescopic · Steering wheel mounted controls: multi-function screen controls · Storage: door pockets · Universal garage door opener: Homelink · Vanity mirrors: dual illuminating
Driver Seat
Adjustable lumbar support: 4-way power · Power adjustments: 12
Drivetrain
Axle ratio: 3.07
Exterior Features
Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Window trim: black
Headrests
Front headrests: power adjustable · Number of front headrests: 2
In Car Entertainment
Connected in-car apps: Google POIs · Infotainment: Apply CarPlay ready · Infotainment screen size: 7 in.
Instrumentation
Fuel economy display: MPG · Warnings and reminders: lamp failure
Lights
Daytime running lights: LED · Exterior entry lights: security approach lamps · Headlights: Auto on/off · Tail and brake lights: LED
Mirrors
Exterior mirrors: integrated turn signals
Passenger Seat
Power adjustments: 12
Roof
Convertible rear window: glass · Convertible roof: with wind blocker · Moonroof: sliding sunshade · Sunroof: panoramic
Safety
Active head restraints: driver · Crumple zones: front · Impact sensor: post-collision safety system · Pre-Collision Warning System: visual warning
Seatbelts
Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front · Seatbelt warning sensor: driver and passenger
Seats
Driver seat power adjustments: reclining · Front seat type: bucket · Passenger seat power adjustments: reclining · Upholstery: leather
Suspension
Driver Adjustable Suspension: ride control · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: strut · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front · Suspension control: electronic
Telematics
Driver assistance app: roadside assistance · Electronic messaging assistance: with voice recognition · Navigation system: with voice recognition · Phone: voice activated · Phone wireless data link: Bluetooth · Satellite communications: mbrace · Smart device app function: horn/light operation
Tires
Type: performance
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: rain sensing
Air Conditioning
Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Dual front knee airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags
Audio System
Antenna Type: diversity · Voice recognition audio system · Auxiliary audio input: iPod/iPhone integration · In-Dash CD: DVD · MP3 player: CD MP3 Playback · Premium Brand: Harman-Kardon · AM/FM radio · Satellite Radio: SiriusXM · 2 subwoofers · Surround audio: 5.1 · Total Number of Speakers: 9 · 600 watts
Brakes
ABS: 4-wheel · Braking assist: hill start assist · Front brake diameter: 14.2 · Front brakes: ventilated disc · Rear brake diameter: 12.6 · Rear brakes: ventilated disc
Comfort Features
Armrests: front center · Center console trim: aluminium · Door trim: aluminum · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: aluminum · Headliner trim: Alcantara · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Adaptive stop and go cruise control: semi-automatic · Ambient lighting: color-adjustable · Center console: front console with storage · Cruise control: adaptive · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: 3 driver · Multi-function remote: trunk release · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: power tilt and telescopic · Steering wheel mounted controls: audio · Storage: door pockets · Universal garage door opener: Homelink · Vanity mirrors: dual illuminating
Driver Seat
Adjustable lumbar support: 4-way power · Power adjustments: 12
Drivetrain
Axle ratio: 3.07
Exterior Features
Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear trunk/liftgate: power operated · Window trim: black
Headrests
Front headrests: power adjustable · Number of front headrests: 2
In Car Entertainment
Connected in-car apps: Google POIs · Infotainment: Apply CarPlay ready · Infotainment screen size: 7 in.
Instrumentation
Fuel economy display: MPG · Warnings and reminders: low oil pressure
Lights
Daytime running lights: LED · Exterior entry lights: security approach lamps · Headlights: LED · Tail and brake lights: LED
Mirrors
Exterior mirrors: power folding
Passenger Seat
Power adjustments: 12
Roof
Convertible rear window: glass · Convertible roof: with wind blocker · Moonroof: sliding sunshade · Sunroof: panoramic
Safety
Active head restraints: driver · Automatic emergency braking: front · Camera system: rearview · Crumple zones: front · Impact sensor: post-collision safety system · Pre-Collision Warning System: audible warning · Rearview monitor: in dash · Traffic sign recognition: adaptive speed limiting
Seatbelts
Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front · Seatbelt warning sensor: driver and passenger
Seats
Driver seat power adjustments: reclining · Front seat type: bucket · Passenger seat power adjustments: reclining · Upholstery: leather
Suspension
Driver Adjustable Suspension: ride control · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: strut · Rear Shock Type: gas shock absorbers · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front · Suspension control: electronic
Telematics
Driver assistance app: roadside assistance · Electronic messaging assistance: with voice recognition · Navigation system: hard drive navigation system · Phone: voice activated · Phone wireless data link: Bluetooth · Satellite communications: mbrace · Smart device app function: lock operation
Tires
Type: performance
Tires and Rims
Wheel type: aluminum alloy
Wheels
Wheel spokes: 10
Windows
Front wipers: variable intermittent
Air Conditioning
Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Dual front knee airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags
Audio System
Antenna Type: diversity · Voice recognition audio system · Bluetooth auxiliary audio input · In-Dash CD: DVD · MP3 player: CD MP3 Playback · Premium Brand: Harman-Kardon · AM/FM radio · Satellite Radio: SiriusXM · 2 subwoofers · Surround audio: 5.1 · Total Number of Speakers: 9 · 600 watts
Brakes
ABS: 4-wheel · Braking assist: hill start assist · Front brake diameter: 14.2 · Front brakes: ventilated disc · Rear brake diameter: 12.6 · Rear brakes: ventilated disc
Comfort Features
Armrests: front center · Center console trim: wood · Door trim: wood · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: aluminum · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Active parking system: driver controlled brake, gas and gear selection · Ambient lighting: color-adjustable · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: steering wheel · Multi-function remote: keyless entry with panic alarm · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: power tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: door pockets · Universal garage door opener: Homelink · Vanity mirrors: dual illuminating
Driver Seat
Adjustable lumbar support: 4-way power · Power adjustments: 12
Drivetrain
Axle ratio: 2.65
Exterior Features
Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear trunk/liftgate: power operated · Window trim: black
Headrests
Front headrests: power adjustable · Number of front headrests: 2
In Car Entertainment
Connected in-car apps: Google POIs · Infotainment: Apply CarPlay ready · Infotainment screen size: 7 in.
Instrumentation
Fuel economy display: MPG · Warnings and reminders: lamp failure
Lights
Daytime running lights: LED · Exterior entry lights: security approach lamps · Headlights: self-leveling · Tail and brake lights: LED
Mirrors
Exterior mirrors: heated
Passenger Seat
Power adjustments: 12
Roof
Convertible rear window: glass · Convertible roof: remote operation · Moonroof: sliding sunshade · Sunroof: panoramic
Safety
Active head restraints: driver · Camera system: rearview · Crumple zones: rear · Impact sensor: post-collision safety system · Parking sensors: front · Pre-Collision Warning System: audible warning · Rearview monitor: in dash
Seatbelts
Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front · Seatbelt warning sensor: driver and passenger
Seats
Driver seat power adjustments: height · Front seat type: bucket · Passenger seat power adjustments: height · Upholstery: leather
Suspension
Driver Adjustable Suspension: ride control · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: strut · Rear Shock Type: coil over shock · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front · Suspension control: electronic
Telematics
Driver assistance app: roadside assistance · Electronic messaging assistance: with voice recognition · Navigation system: hard drive navigation system · Phone: voice activated · Phone wireless data link: Bluetooth · Satellite communications: mbrace · Smart device app function: horn/light operation
Tires
Type: performance
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: variable intermittent
Air Conditioning
Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Dual front knee airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags
Audio System
Antenna Type: diversity · Voice recognition audio system · Auxiliary audio input: iPod/iPhone integration · 6 disc in-dash CD · MP3 player: CD MP3 Playback · Premium Brand: Harman-Kardon · AM/FM radio · Satellite Radio: SiriusXM · 2 subwoofers · Surround audio: 5.1 · Total Number of Speakers: 9 · 600 watts
Brakes
ABS: 4-wheel · Braking assist: hill start assist · Front brake diameter: 14.2 · Front brakes: ventilated disc · Rear brake diameter: 12.6 · Rear brakes: ventilated disc
Comfort Features
Armrests: front center · Center console trim: wood · Door trim: wood · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: aluminum · Headliner trim: Alcantara · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Active parking system: driver controlled brake, gas and gear selection · Adaptive stop and go cruise control: semi-automatic · Ambient lighting: color-adjustable · Center console: front console with storage · Cruise control: adaptive · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: 3 driver · Multi-function remote: trunk release · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: power tilt and telescopic · Steering wheel mounted controls: multi-function screen controls · Storage: door pockets · Universal garage door opener: Homelink · Vanity mirrors: dual illuminating
Driver Seat
Adjustable lumbar support: 4-way power · Power adjustments: 12
Drivetrain
Axle ratio: 2.65
Exterior Features
Door handle color: body-color · Exhaust: dual exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear trunk/liftgate: power operated · Window trim: black
Headrests
Front headrests: power adjustable · Number of front headrests: 2
In Car Entertainment
Connected in-car apps: Google search · Infotainment: Apply CarPlay ready · Infotainment screen size: 7 in.
Instrumentation
Fuel economy display: MPG · Warnings and reminders: low fuel level
Lights
Daytime running lights: LED · Exterior entry lights: security approach lamps · Headlights: auto delay off · Tail and brake lights: LED
Mirrors
Exterior mirrors: power
Passenger Seat
Power adjustments: 12
Roof
Convertible rear window: glass · Convertible roof: power retractable hard top · Moonroof: sliding sunshade · Sunroof: panoramic
Safety
Active head restraints: driver · Automatic emergency braking: front · Camera system: rearview · Crumple zones: rear · Impact sensor: post-collision safety system · Parking sensors: rear · Pre-Collision Warning System: audible warning · Rearview monitor: in dash · Traffic sign recognition: adaptive speed limiting
Seatbelts
Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front · Seatbelt warning sensor: driver and passenger
Seats
Driver seat power adjustments: height · Front seat type: bucket · Passenger seat power adjustments: 4-way power lumbar · Upholstery: leather
Suspension
Driver Adjustable Suspension: ride control · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: multi-link · Rear Shock Type: coil over shock · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front · Suspension control: electronic
Telematics
Driver assistance app: roadside assistance · Electronic messaging assistance: with voice recognition · Navigation system: hard drive navigation system · Phone: voice activated · Phone wireless data link: Bluetooth · Satellite communications: mbrace · Smart device app function: horn/light operation
Tires
Type: performance
Tires and Rims
Wheel type: aluminum alloy
Wheels
Wheel spokes: 10
Windows
Front wipers: rain sensing
Air Conditioning
Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Dual front knee airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags
Audio System
Antenna Type: diversity · Voice recognition audio system · Auxiliary audio input: iPod/iPhone integration · In-Dash CD: DVD · MP3 player: CD MP3 Playback · Premium Brand: Harman-Kardon · AM/FM radio · Satellite Radio: SiriusXM · 2 subwoofers · Surround audio: 5.1 · Total Number of Speakers: 9 · 600 watts
Brakes
ABS: 4-wheel · Braking assist: hill start assist · Front brake diameter: 15.4 · Front brakes: ventilated disc · Rear brake diameter: 14.2 · Rear brakes: ventilated disc
Comfort Features
Armrests: front center · Center console trim: carbon · Door sill trim: illuminated scuff plate · Door trim: carbon · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: aluminum · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Active parking system: driver controlled brake, gas and gear selection · Ambient lighting: color-adjustable · Center console: front console with storage · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: 3 driver · Multi-function remote: proximity entry system · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: power tilt and telescopic · Steering wheel mounted controls: audio · Storage: door pockets · Universal garage door opener: Homelink · Vanity mirrors: dual illuminating
Driver Seat
Adjustable lumbar support: 4-way power · Power adjustments: 12
Drivetrain
Axle ratio: 2.65 · Limited slip differential: rear
Exterior Features
Door handle color: body-color · Exhaust: quad exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: lip · Rear spoiler color: body-color · Rear trunk/liftgate: power operated · Window trim: black
Headrests
Front headrests: power adjustable · Number of front headrests: 2
In Car Entertainment
Connected in-car apps: Facebook · Infotainment: Apply CarPlay ready · Infotainment screen size: 7 in.
Instrumentation
Fuel economy display: MPG · Warnings and reminders: low oil pressure
Lights
Daytime running lights: LED · Exterior entry lights: security approach lamps · Headlights: cornering · Tail and brake lights: LED
Mirrors
Exterior mirrors: heated
Passenger Seat
Power adjustments: 12
Roof
Convertible rear window: glass · Convertible roof: remote operation · Moonroof: sliding sunshade · Sunroof: panoramic
Safety
Active head restraints: driver · Camera system: rearview · Crumple zones: rear · Impact sensor: post-collision safety system · Parking sensors: rear · Pre-Collision Warning System: audible warning · Rearview monitor: in dash
Seatbelts
Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front · Seatbelt warning sensor: driver and passenger
Seats
Driver seat power adjustments: height · Front seat type: bucket · Passenger seat power adjustments: height · Upholstery: premium leather
Spare Tire
Kit: tire sealant
Suspension
Driver Adjustable Suspension: ride control · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: strut · Rear Shock Type: coil over shock · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): rear · Suspension control: electronic
Telematics
Driver assistance app: roadside assistance · Electronic messaging assistance: with voice recognition · Navigation system: hard drive navigation system · Phone: voice activated · Phone wireless data link: Bluetooth · Satellite communications: mbrace · Smart device app function: maintenance status
Tires
Type: performance
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: variable intermittent
Air Conditioning
Active charcoal air filtration · Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Dual front knee airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side airbags · Front side curtain airbags
Audio System
Antenna Type: diversity · Voice recognition audio system · Bluetooth auxiliary audio input · 6 disc in-dash CD · MP3 player: CD MP3 Playback · Premium Brand: Bang & Olufsen · AM/FM radio · Satellite Radio: SiriusXM · 2 subwoofers · Surround audio: 5.1 · Total Number of Speakers: 12 · 900 watts
Brakes
ABS: 4-wheel · Braking assist: hill start assist · Front brake diameter: 15.4 · Front brakes: ventilated disc · Rear brake diameter: 14.2 · Rear brakes: ventilated disc
Comfort Features
Armrests: front center · Center console trim: carbon · Door sill trim: illuminated scuff plate · Door trim: carbon · Floor Mat Material: carpet · Floor Material: carpet · Floor Mats: front · Foot pedal trim: aluminum · Shift knob trim: leather · Steering wheel trim: leather
Convenience Features
Active parking system: driver controlled brake, gas and gear selection · Adaptive stop and go cruise control: semi-automatic · Ambient lighting: color-adjustable · Center console: front console with storage · Cruise control: adaptive · Cupholders: front · Dimming rearview mirror: auto-dimming · Memorized settings: steering wheel · Multi-function remote: proximity entry system · One-touch windows: 2 · Power outlet(s): 12V front · Power steering: speed-proportional · Power windows: lockout button · Reading lights: front · Steering wheel: power tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: door pockets · Universal garage door opener: Homelink · Vanity mirrors: dual illuminating
Driver Seat
Adjustable lumbar support: 4-way power · Power adjustments: 12
Drivetrain
Axle ratio: 2.65 · Limited slip differential: rear
Exterior Features
Door handle color: body-color · Exhaust: quad exhaust tips · Exhaust tip color: stainless-steel · Front bumper color: body-color · Grille color: black · Mirror color: body-color · Rear bumper color: body-color · Rear spoiler: lip · Rear spoiler color: body-color · Rear trunk/liftgate: power operated · Side door type: soft close · Window trim: black
Headrests
Front headrests: power adjustable · Number of front headrests: 2
In Car Entertainment
Connected in-car apps: Google POIs · Infotainment: Apply CarPlay ready · Infotainment screen size: 7 in.
Instrumentation
Fuel economy display: MPG · Warnings and reminders: low fuel level
Lights
Daytime running lights: LED · Exterior entry lights: security approach lamps · Headlights: Auto on/off · Tail and brake lights: LED
Mirrors
Exterior mirrors: integrated turn signals
Passenger Seat
Power adjustments: 12
Roof
Convertible rear window: glass · Convertible roof: with wind blocker · Moonroof: sliding sunshade · Sunroof: panoramic
Safety
Active head restraints: driver · Automatic emergency braking: front · Camera system: rearview · Cross Traffic Alert: rear · Crumple zones: rear · Impact sensor: post-collision safety system · Parking sensors: front · Pre-Collision Warning System: visual warning · Rearview monitor: in dash
Seatbelts
Front seatbelts: 3-point · Seatbelt force limiters: front · Seatbelt pretensioners: front · Seatbelt warning sensor: driver and passenger
Seats
Driver seat power adjustments: height · Front seat type: bucket · Passenger seat power adjustments: height · Upholstery: premium leather
Spare Tire
Kit: tire sealant
Suspension
Driver Adjustable Suspension: ride control · Front Shock Type: gas shock absorbers · Front Spring Type: coil springs · Front Suspension Classification: independent · Front Suspension Type: strut · Rear Shock Type: coil over shock · Rear Spring Type: coil springs · Rear Suspension Classification: independent · Rear Suspension Type: multi-link · Stabilizer bar(s): front · Suspension control: electronic
Telematics
Driver assistance app: roadside assistance · Electronic messaging assistance: with voice recognition · Navigation system: with voice recognition · Phone: voice activated · Phone wireless data link: Bluetooth · Satellite communications: mbrace · Smart device app function: vehicle location
Tires
Type: performance
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: speed sensitive