Peterbilt 579 vs Mazda RX7
Both cars' complete complaint records, side by side.
Read the totals carefully. NHTSA publishes no sales figures, so the car that sold more collects more complaints regardless of quality. The rows worth weighing are the proportions — the share of complaints that involved harm, and which part dominates.
| Measure | Peterbilt 579 | Mazda RX7 |
|---|---|---|
| Complaints on file | 58 | 144 |
| Model years covered | 2013–2026 | 1982–1989 |
| Worst model year | — | — |
| Best model year | — | — |
| Crashes reported | 1 | 4 |
| Fires reported | 7 | 52 |
| Injuries reported | 1 | 7 |
| Deaths reported | 0 | 2 |
| Most complained-about part | Electrical System | Fuel & Propulsion |
| Share of complaints involving harm | 15.5% | 45.1% |
Peterbilt 579 by year
What breaks
Electrical System
12
20.7%
Transmission & Drivetrain
11
19.0%
Brakes
8
13.8%
Steering
5
8.6%
Tires
5
8.6%
Suspension
4
6.9%
Engine & Cooling
3
5.2%
Fuel & Propulsion
2
3.4%
Mazda RX7 by year
What breaks
Fuel & Propulsion
60
41.7%
Seat Belts
23
16.0%
Engine & Cooling
20
13.9%
Electrical System
17
11.8%
Windows, Mirrors & Wipers
8
5.6%
Brakes
4
2.8%
Equipment & Accessories
3
2.1%
Steering
2
1.4%