2018 Porsche 911 Reliability

Measures the level of defects, malfunctions, and design flaws experienced by vehicle owners. Covers the entire vehicle from engine to infotainment system. A higher rating means fewer problems.

Owners' evaluation of the vehicle's design, performance, comfort, functionality, safety, and technology, comprise this rating. Newer and recently-redesigned vehicles tend to score better.

JD Power's forecast of depreciation (how much of its current value the vehicle will likely lose) over the next three years. Lower depreciation equals a higher rating.

Owners' experience with this brand's dealerships during the purchase and service process make up this rating. Key factors include customer service, dealership facilities, and the quality of work.