Porsche 718 Boxster S vs. BMW Z4 M40i
iSeeCars' unbiased and data-driven comparison of the Porsche 718 Boxster S and BMW Z4 M40i contrasts the two cars across a broad spectrum of vehicle specifications to determine which car is better. In addition to comparing pricing and specs, iSeeCars uses all the ratings, rankings, and insights from its comprehensive analyses of each vehicle model, including calculations of reliability, safety, depreciation, value retention, and the vehicle's projected lifetime recalls (based on analyzing over 25 billion data points). This in-depth evaluation is used to identify which vehicle represents a better overall choice for shoppers who are considering both the Porsche 718 Boxster S and the BMW Z4 M40i.
When comparing the Porsche 718 Boxster S's and the BMW Z4 M40i's specifications and ratings, the Porsche 718 Boxster S has the advantage in the areas of resale value and overall quality score. The BMW Z4 M40i has the advantage in the areas of new vehicle base pricing, reliability and base engine power. Based on this comparison of the Porsche 718 Boxster S's and the BMW Z4 M40i's specifications and ratings, the BMW Z4 M40i is a better car than the Porsche 718 Boxster S.
Pricing: For a new model, the Porsche 718 Boxster S's price is between $93,576 and $115,002, with the BMW Z4 M40i priced between $71,893 and $77,821.
Resale/Retained Value: Looking at the 5-year depreciation rate for both models, the Porsche 718 Boxster S loses 26.9 percent of its value and the BMW Z4 M40i loses 48.7 percent of its value. This means the Porsche 718 Boxster S retains 21.8 percentage points more of its value and has the advantage of higher resale value versus the BMW Z4 M40i.
Quality Rating: The iSeeCars Overall Quality rating for the Porsche 718 Boxster is 7.9 out of 10 while the BMW Z4's quality rating is 7.7 out of 10. This results in the Porsche 718 Boxster being ranked 4 out of 27 Best Luxury Convertibles and the BMW Z4 being ranked 6 out of 27. Out of 41 Best Luxury Sports Cars, the Porsche 718 Boxster is ranked 11 and the BMW Z4 is ranked 15.
Reliability Rating: iSeeCars’ Reliability Rating for the Porsche 718 Boxster is 7.0 out of 10. For the BMW Z4 the reliability rating is 8.0 out of 10. This gives the BMW Z4 an advantage in reliability compared to the Porsche 718 Boxster.
Engine Power and Fuel Efficiency Comparison: For engine performance, the Porsche 718 Boxster S’s base engine makes 350 horsepower, and the BMW Z4 M40i base engine makes 382 horsepower.
New Car Pricing
Asking Price:
$93,576 - $115,002
Starting MSRP:
$82,400
Category Avg Starting MSRP:
(Luxury Sports Cars)
$102,671
Category Starting MSRP Range:
(Luxury Sports Cars)
$46,440 - $273,000
New Car Pricing
Asking Price:
$71,893 - $77,821
Starting MSRP:
$66,450
Category Avg Starting MSRP:
(Luxury Sports Cars)
$103,210
Category Starting MSRP Range:
(Luxury Sports Cars)
$54,050 - $148,800
Used Car Pricing
Avg Used Car Price:
$103,523
Price Range:
$83,022 - $118,960
Category Avg Price:
(Luxury Sports Cars)
$126,819
Category Avg Price Range:
(Luxury Sports Cars)
$63,681 - $273,789
# Used Cars for Sale Nationally:
10
Avg Mileage of Used Cars for Sale:
2,163
# Good or Great Deals:
0
Used Car Pricing
Avg Used Car Price:
Price Range:
-
Category Avg Price:
N/A
Category Avg Price Range:
N/A
# Used Cars for Sale Nationally:
89
Avg Mileage of Used Cars for Sale:
208
# Good or Great Deals:
0
5-year Depreciation
Depreciation $:
$22,040
Depreciation %:
26.7%
Resale Value $:
$60,360
Residual Value %:
73.3%
Typical Category Depreciation %:
(Luxury Sports Cars)
30.2%
Category Depreciation Range:
(Luxury Sports Cars)
8.9% - 50.9%
5-year Depreciation
Depreciation $:
$32,362
Depreciation %:
48.7%
Resale Value $:
$34,088
Residual Value %:
51.3%
Typical Category Depreciation %:
(Luxury Sports Cars)
45.1%
Category Depreciation Range:
(Luxury Sports Cars)
42% - 50.6%
Porsche 718 Boxster Scores & Rankings
Overall Score:
7.9 / 10
Reliability:
7.0 / 10
Retained Value:
8.8 / 10
Safety:
Not available
BMW Z4 Scores & Rankings
Overall Score:
7.7 / 10
Reliability:
8.0 / 10
Retained Value:
7.5 / 10
Safety:
Not available
iSeeCars Reliability Insights for Porsche 718 Boxster S
Avg Life Expectancy (years):
Typical Category Life Expectancy:
(Luxury Sports Cars)
12.9
Category Life Expectancy Range:
(Luxury Sports Cars)
10.1 - 17.2
Chance of Reaching 200k Miles for a New Car:
iSeeCars Reliability Insights for BMW Z4 M40i
Avg Life Expectancy (years):
11.1
Typical Category Life Expectancy:
(Luxury Sports Cars)
12.9
Category Life Expectancy Range:
(Luxury Sports Cars)
11.1 - 12.9
Chance of Reaching 200k Miles for a New Car:
0%
Expected 30-year Lifetime Recalls
Expected Lifetime Recalls:
13.4
Typical Category Recalls:
(Luxury Sports Cars)
2.9
Category Range for Recalls:
(Luxury Sports Cars)
0.8 - 13.4
Expected 30-year Lifetime Recalls
Expected Lifetime Recalls:
Typical Category Recalls:
N/A
Category Range for Recalls:
N/A
Porsche 718 Boxster Rankings
Ranking
1 out of / 27Ranking
1 out of / 7Ranking
1 out of / 3Ranking
1 out of / 3Ranking
2 out of / 6Ranking
3 out of / 41Ranking
4 out of / 27Ranking
7 out of / 19Ranking
11 out of / 41Ranking
12 out of / 32Ranking
13 out of / 27Ranking
17 out of / 27Ranking
20 out of / 41Ranking
24 out of / 41BMW Z4 Rankings
Ranking
1 out of / 19Ranking
2 out of / 32Ranking
2 out of / 5Ranking
2 out of / 3Ranking
3 out of / 27Ranking
3 out of / 7Ranking
4 out of / 27Ranking
4 out of / 27Ranking
4 out of / 6Ranking
6 out of / 41Ranking
6 out of / 27Ranking
7 out of / 41Ranking
7 out of / 41Ranking
15 out of / 41Ranking
20 out of / 27Ranking
20 out of / 27Ranking
34 out of / 41Ranking
35 out of / 41Available Body Styles
Convertible
Available Body Styles
Convertible
Available Drivetrain Options
Gasoline
Available Drivetrain Options
Gasoline
Other Porsche 718 Boxster Trim Levels
Base, GTS 4.0, Spyder RS, Style Edition
Other BMW Z4 Trim Levels
sDrive30i
Warranty Information
Warranty, Bumper-to-Bumper:
4 years / 50000 miles
Warranty, Powertrain:
4 years / 50000 miles
Warranty, Roadside Assistance:
4 years / 50000 miles
Warranty Information
Warranty, Bumper-to-Bumper:
4 years / 50000 miles
Warranty, Powertrain:
4 years / 50000 miles
Warranty, Roadside Assistance:
4 years
Safety Ratings
NHTSA Safety Rating (last 5 year average):
Not yet available
2025 NHTSA Overall Rating:
Not yet available
2025 NHTSA Front Crash Overall Rating:
Not yet available
2025 NHTSA Side Crash Overall Rating:
Not yet available
2025 NHTSA Rollover Rating:
Not yet available
IIHS Safety Rating:
Not yet available
Safety Ratings
NHTSA Safety Rating (last 5 year average):
Not yet available
2025 NHTSA Overall Rating:
Not yet available
2025 NHTSA Front Crash Overall Rating:
Not yet available
2025 NHTSA Side Crash Overall Rating:
Not yet available
2025 NHTSA Rollover Rating:
Not yet available
IIHS Safety Rating:
Not yet available
Base Drivetrain Specs
Horsepower:
350 hp @ 6500 rpm
Torque:
309 foot-lbs @ 1900 rpm
Power-to-Weight Ratio (higher is better):
0.114 hp per pound
Base Drivetrain Specs
Horsepower:
382 hp @ 5800 rpm
Torque:
369 foot-lbs @ 1800 rpm
Power-to-Weight Ratio (higher is better):
0.108 hp per pound
Engine Specifications
Engine Size:
2.5 liters
Engine Configuration:
Flat/Horizontally Opposed
Number of Cylinders:
4
Transmission:
Manual
Standard/Optional Drivetrain Type:
RWD
EPA Fuel Economy
(City/Highway/Combined MPG):
19 / 24 / 21
Range (city/hwy):
321 / 406 miles
Recommended Fuel Type:
Premium Unleaded
Engine Specifications
Engine Size:
3 liters
Engine Configuration:
Inline
Number of Cylinders:
6
Transmission:
Automatic
Standard/Optional Drivetrain Type:
RWD
EPA Fuel Economy
(City/Highway/Combined MPG):
Not yet available
Range (city/hwy):
Not yet available
Recommended Fuel Type:
Not yet available
Standard/Optional Features
Alloy wheels:
Standard
Apple CarPlay:
Standard
Bluetooth:
Standard
Heated Seats
Standard
Keyless Entry:
Standard
Leather Upholstery:
Standard
Parking Sensors:
Standard
Power outlet:
Standard
Satellite radio:
Standard
Voice Recognition:
Standard
Adaptive Cruise Control:
Available
Cooled/Ventilated Seats:
Available
Heated Steering Wheel:
Available
Keyless Ignition:
Available
Navigation System:
Available
Wireless Smartphone Charging:
Available
Air Suspension:
N/A
Android Auto:
N/A
Automatic Parking:
N/A
Bench Seats:
N/A
Captain's seat:
N/A
Front Bench Seats:
N/A
Internet Radio:
N/A
Massage Seats:
N/A
Paddle Shifters:
N/A
Panoramic Sunroof/Moonroof
N/A
Power Lift Gate:
N/A
Quad Seats:
N/A
Roadside assistance:
N/A
Roof Rack:
N/A
Sunroof/Moonroof:
N/A
Trailer Hitch:
N/A
Wifi:
N/A
Standard/Optional Features
Alloy wheels:
Standard
Apple CarPlay:
Standard
Bluetooth:
Standard
Heated Seats
Standard
Keyless Entry:
Standard
Leather Upholstery:
Standard
Parking Sensors:
Available
Power outlet:
Standard
Satellite radio:
Standard
Voice Recognition:
Standard
Adaptive Cruise Control:
Available
Cooled/Ventilated Seats:
N/A
Heated Steering Wheel:
Standard
Keyless Ignition:
Standard
Navigation System:
Standard
Wireless Smartphone Charging:
Available
Air Suspension:
N/A
Android Auto:
Standard
Automatic Parking:
Available
Bench Seats:
N/A
Captain's seat:
N/A
Front Bench Seats:
N/A
Internet Radio:
Standard
Massage Seats:
N/A
Paddle Shifters:
Standard
Panoramic Sunroof/Moonroof
N/A
Power Lift Gate:
N/A
Quad Seats:
N/A
Roadside assistance:
Standard
Roof Rack:
N/A
Sunroof/Moonroof:
N/A
Trailer Hitch:
N/A
Wifi:
N/A
Safety Features
Backup camera:
Standard
360-Degree Camera:
N/A
Blind Spot Monitoring:
N/A
Driver Attention Monitoring:
N/A
Forward Collision Warning:
N/A
Lane Departure Warning:
N/A
Lane Keeping Assist:
N/A
Pedestrian Detection:
N/A
Rear Cross-Traffic Alert:
N/A
Rear Seat Reminder:
N/A
Safety Features
Backup camera:
Standard
360-Degree Camera:
N/A
Blind Spot Monitoring:
N/A
Driver Attention Monitoring:
Standard
Forward Collision Warning:
Standard
Lane Departure Warning:
N/A
Lane Keeping Assist:
N/A
Pedestrian Detection:
Standard
Rear Cross-Traffic Alert:
N/A
Rear Seat Reminder:
N/A
Interior Dimensions
Front Head Room:
Not yet available
Front Leg Room:
Not yet available
Front Shoulder Room:
Not yet available
Rear Head Room:
Not yet available
Rear Leg Room:
Not yet available
Rear Shoulder Room:
Not yet available
Cargo Space:
9.6 cubic feet
Overall Interior Volume:
Not yet available
Interior Dimensions
Front Head Room:
38.9 inches
Front Leg Room:
42.2 inches
Front Shoulder Room:
54.3 inches
Rear Head Room:
Not yet available
Rear Leg Room:
Not yet available
Rear Shoulder Room:
Not yet available
Cargo Space:
9.9 cubic feet
Overall Interior Volume:
Not yet available
Exterior Dimensions
Curb Weight:
3071 lbs
Width:
78.5 inches
Height:
50.4 inches
Length:
172.4 inches
Wheelbase:
97.4 inches
Ground Clearance:
4.3 inches
Exterior Dimensions
Curb Weight:
3543 lbs
Width:
79.7 inches
Height:
51.3 inches
Length:
170.7 inches
Wheelbase:
97.2 inches
Ground Clearance:
4.7 inches
Standard Wheel/Tire Information
Wheel Size:
19.0 x 8.0 inches
Wheel Type:
painted aluminum alloy
Tire Size:
235/40ZR19
Standard Wheel/Tire Information
Wheel Size:
18.0 x 9.0 inches
Wheel Type:
aluminum alloy
Tire Size:
255/40R18
