Scoring Methodology
What Buyability Means
My first car cost $500. It was a 1995 Honda Accord, and it barely worked. I remember once, I was having difficulty slowing down at stop signs, suggesting a potential issue with the brakes. So, I took the car to a local brake shop (as one does) and was confronted with a $500 estimate to replace the pads and turn the rotors. I didn't have $500, so I took it home and replaced the brakes myself (it took me all day). Since then, I have been interested in what makes a car worth the money, and how I could translate that into something others could use to make good decisions when purchasing a vehicle. “Buyability” is a score that attempts to quantify how much value a car is for the money. It is calculated based on a variety of factors, including the car's durability, reliability, and repair costs. Use this score to guide you in your car buying journey, and I hope it can help make that journey a little less frought with peril.
How the Score Is Calculated
Each category is scored on a 1 to 10 scale, weighted by its share of the model, then combined and multiplied by 10 to produce a 100-point score. The final result is then reduced by complaint and catastrophic penalties when issue volume, severity, or systemic failure patterns justify added risk.
Durability and Longevity
Measures how well the vehicle platform tends to hold up over time. This category carries the most weight because long-term durability is central to ownership risk.
Major Failure Risk
Captures the likelihood of expensive, high-impact failures in core systems such as the engine, transmission, or drivetrain.
Repair Frequency and Severity
Reflects how often owners report problems and how disruptive those repairs tend to be when they occur.
Ownership Cost Profile
Estimates the financial burden of keeping the vehicle on the road, with attention to repair cost patterns and cost exposure.
Safety and Recall Stability
Reviews recall history and safety-related complaint behavior to identify models with persistent safety instability.
Category Definitions
The model separates durability, failure risk, repair patterns, ownership cost, and recall stability so different types of risk are not treated as the same problem. Mechanical issues affect durability and cost, complaint clusters signal frequency, and recalls are evaluated as a distinct safety input.
Durability and Longevity
Weight: 40%. This score reflects how reliably the vehicle platform ages, with emphasis on long-run mechanical durability, service life, and whether major systems hold up at higher mileage.
Major Failure Risk
Weight: 25%. This category focuses on low-frequency but high-cost failures, especially engine, transmission, and other systemic breakdowns that materially change ownership risk.
Repair Frequency and Severity
Weight: 15%. It captures how often issues appear in owner and complaint data, then adjusts for how serious or operationally disruptive those repairs tend to be.
Ownership Cost Profile
Weight: 10%. This category uses repair cost estimates and cost concentration to measure whether a vehicle is likely to be cheap to keep running or prone to expensive maintenance events.
Safety and Recall Stability
Weight: 10%. Recall history and safety-related complaint patterns are used here to identify recurring safety defects, unstable recall performance, and unresolved risk signals.
Catastrophic Risk Adjustment
An extra penalty is applied when the data shows evidence of severe systemic failures that are not fully captured by the weighted category average alone. This adjustment is intended for catastrophic patterns such as widespread engine or transmission failures that can make an otherwise average score misleading.
Data Sources and Limitations
Scores are built from NHTSA complaints and recalls, aggregated owner-reported issues, and repair cost estimates. Coverage and reporting quality vary by model year, trim, mileage, and owner behavior, so the score should be read as a structured estimate of risk rather than a complete record of every problem. As I build this out, I will be adding more data sources and refining the methodology.
How to Use This Score
Use the score to compare expected ownership risk across vehicles, not as a guarantee of how any single car will perform. Higher scores generally indicate stronger durability and lower downside risk, while lower scores suggest more caution and closer review of failure, complaint, and recall history.