VS
At a Glance
Power
523hp @ 6250
577hp @ 5500
Torque
479lb-ft @ 2750
590lb-ft @ 2500
Engine
3.0 L/183cc
4.0 L/243cc
Choosing between the BMW 4 Series and the Mercedes-Benz Sl Class is one of the most common decisions car buyers in the United States face. The BMW 4 Series delivers 523hp @ 6250 while the Mercedes-Benz Sl Class produces 577hp @ 5500. Pricing starts at $51,200 for the 4 Series and $112,550 for the Sl Class. Both vehicles have their merits. The right choice depends on your priorities: fuel economy, performance, towing ability, safety features or total cost of ownership. This comparison covers every specification available so you can make an informed decision.
Performance
Power Output (hp)
523hp @ 6250
577hp @ 5500
Torque (lb-ft)
479lb-ft @ 2750
590lb-ft @ 2500
Engine & Drivetrain
Engine Capacity
3.0 L/183cc
4.0 L/243cc
Engine Layout
Inline
—
Cylinders
6
8
Fuel Type
Gasoline
Gasoline
Forced Induction Device
Turbocharged
Turbocharged
Transmission
Automatic
Automatic
Number of Gears
8
—
Drive Wheels
All Wheel Drive
All Wheel Drive
Fuel Economy
Fuel Economy - City (mpg)
16mpg
14 (2025)mpg
Fuel Economy - Highway (mpg)
23mpg
21 (2025)mpg
Fuel Tank Capacity (gal)
15.6gal
18.5gal
Dimensions
Length (in)
189.1in
185.2in
Width (in)
74.3in
75.4in
Height (in)
54.9in
53.5in
Wheelbase (in)
112.5in
106.3in
Curb Weight (lbs)
3979lbs
4321lbs
Safety
ABS
✓ Standard
✓ Standard
Brake Assist
✓ Standard
✓ Standard
Stability Control
✓ Standard
✓ Standard
Traction Control
✓ Standard
✓ Standard
Driver Airbag
✓ Standard
✓ Standard
Passenger Airbag
✓ Standard
✓ Standard
Side Airbags Front
✓ Standard
✓ Standard
Curtain Airbags
✓ Standard
✓ Standard
Features & Tech
Air Conditioning
✓ Standard
✓ Standard
Climate Control
✓ Standard
✓ Standard
Cruise Control
✓ Standard
✓ Standard
Adaptive Cruise Control
✓ Standard
✓ Standard
Bluetooth
✓ Standard
✓ Standard
Backup Camera
✓ Standard
✓ Standard
Rear Parking Aid
✓ Standard
✓ Standard
Sunroof
✓ Standard
—
Heated Seats
✓ Standard
✓ Standard
Power Seat Adjustment
✓ Standard
✓ Standard
Keyless Entry
✓ Standard
✓ Standard
Alloy Wheels
✓ Standard
✓ Standard
The Verdict
Which Wins?
Overall Winner
BMW 4 Series
1 / 4 categories
Performance
Tied
Fuel Economy
Tied
Value
4 Series
Practicality
Tied
Pros & Cons
BMW 4 Series
Lower starting price ($51,200)
Few notable weaknesses
Mercedes-Benz Sl Class
Well-rounded specification
Higher starting price
Frequently Asked Questions
Which has more power, the 4 Series or Sl Class?
The 4 Series produces 523hp @ 6250 and 479lb-ft @ 2750 of torque while the Sl Class delivers 577hp @ 5500 and 590lb-ft @ 2500 of torque. They produce similar power outputs.
What is the price difference between the 4 Series and Sl Class?
The 4 Series starts from $51,200 and the Sl Class from $112,550. The 4 Series is cheaper by $61,350 at this variant level. Final on-the-road pricing varies by dealer and specification.
Should I buy the 4 Series or the Sl Class?
It depends on your priorities. If fuel economy matters most, check the mpg figures above. If you need towing capacity, compare the towing ratings. For day-to-day driving - commutes, school runs and highway trips - consider ground clearance, service network coverage, and total cost of ownership including insurance and maintenance. Use the spec tables above to compare every detail before making your decision.
Also Consider