Compare the2025 Porsche 718 CaymanVS 2025 BMW 8 Series

Both the 718 Cayman and the 8 Series have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available crash mitigating brakes and blind spot warning systems.

J.D. Power and Associates’ 2024 Initial Quality Study of new car owners surveyed provide the statistics that show that Porsche vehicles are better in initial quality than BMW vehicles. J.D. Power ranks Porsche above average in initial quality. With 34 more problems per 100 vehicles, BMW is rated below average.

J.D. Power and Associates’ 2024 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Porsche vehicles are more reliable than BMW vehicles. J.D. Power ranks Porsche above average in long-term dependability. With 15 more problems per 100 vehicles in the first three years of ownership, BMW is rated lower.

From surveys of all its subscribers, Consumer Reports’ January 2024 Auto Issue reports that Porsche vehicles are more reliable than BMW vehicles. Consumer Reports ranks Porsche 1 place higher in reliability than BMW.

As tested in Motor Trend the Porsche 718 Cayman is faster than the M850i 4.4 turbo V8 (automatics tested):

As tested in Car and Driver the 718 Cayman GT4 RS 4.0 DOHC 6-cylinder is faster than the M850i 4.4 turbo V8 (automatics tested):

The flat cylinder configuration of the boxer engine in the 718 Cayman lowers its center of gravity, enhancing handling stability. The 8 Series doesn’t offer a boxer engine configuration.

An engine control system that can shut down some of the engine’s cylinders helps improve the 718 Cayman GT4 RS/GTS 4.0’s fuel efficiency. The 8 Series doesn’t offer a system that can shut down part of the engine.

The 718 Cayman offers a manual transmission for better acceleration, control and sportiness. The 8 Series doesn’t offer a manual transmission.

The 718 Cayman offers an optional sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The 8 Series doesn’t offer an SMG.

For better stopping power the 718 Cayman GT4 RS CCB’s front brake rotors are larger than those on the 8 Series:

The 718 Cayman GT4 RS offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The 8 Series doesn’t offer ceramic brake rotors.

The 718 Cayman stops much shorter than the 8 Series:

The 718 Cayman GT4 RS handles at 1.11 G’s, while the M850i xDrive Coupe pulls only .98 G’s of cornering force in a Car and Driver skidpad test.

The 718 Cayman executes Motor Trend’s “Figure Eight” maneuver 1.1 seconds quicker than the M850i xDrive Coupe (23.1 seconds @ .87 average G’s vs. 24.2 seconds @ .85 average G’s).

For better maneuverability, the 718 Cayman’s turning circle is 2 feet tighter than the 8 Series’ (36.1 feet vs. 38.1 feet). The 718 Cayman GT4 RS’ turning circle is 1.6 feet tighter than the 8 Series xDrive’s (37.4 feet vs. 39 feet).

The Porsche 718 Cayman may be more efficient, handle and accelerate better because it weighs about 850 to 1450 pounds less than the BMW 8 Series.

The 718 Cayman is 1 foot, 6.8 inches shorter than the 8 Series, making the 718 Cayman easier to handle, maneuver and park in tight spaces.

The 718 Cayman has .2 inches more front headroom and .1 inches more front legroom than the 8 Series Coupe.

J.D. Power and Associates surveys of service recipients show that Porsche service is better than BMW. J.D. Power ranks Porsche second in service department satisfaction. With a 32% lower rating, BMW is ranked 13th.

The 718 Cayman’s instruments include an oil pressure gauge and a temperature gauge - which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The 8 Series does not have an oil pressure gauge.

To improve rear visibility by keeping the rear window clear, the 718 Cayman offers an optional rear wiper. The 8 Series doesn’t offer a rear wiper.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The 718 Cayman has standard headlight washers to keep headlight output high. The 8 Series doesn’t offer headlight washers.

Insurance will cost less for the 718 Cayman owner. The Complete Car Cost Guide estimates that insurance for the 718 Cayman will cost $5715 less than the 8 Series over a five-year period.

The 718 Cayman will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the 718 Cayman will retain 59.55% to 67.21% of its original price after five years, while the 8 Series only retains 42.63% to 42.96%.

The 718 was chosen as a Car and Driver’s “Top Ten” for 2025 and 19 more times in the last 20 years. The 8 Series has never been chosen by Car and Driver in their “10Best” issue.