In the servicing menu, it can be seen in the car condition bar that every car has 7 red 'bars' and 17 green 'bars'. If the car condition goes into the red, then the car loses performance.
From testing, car condition decreases at a rate of 0.8 'bars' per kilometer driven (or 1.25 km driven per 'bar'). It is independent of car damage, speed driven or time taken. This means a car can be driven 21.25 km before it needs servicing.
However, driving off-track will decrease car condition much more rapidly. A rough estimate is that driving off-road decreases at a rate of ~5.6 'bars' per kilometer driven (or ~0.18 km driven per 'bar'), a ~600% increase in damage. Note that this includes ANY driving off-track, even if two wheels are off-track but two-wheels remain on track. Driving off-track is accompanied by an off-road sound effect to warn a player.
A table of how many 'bars' a car's condition decreases per lap:
| Circuit | Variant | Length per lap (km) | Condition decrease per lap |
|---|---|---|---|
| Autodromo Nazionale Monza | Junior Course | 2.45 | 2.0 |
| Road Course | 5.82 | 4.7 | |
| Brands Hatch | Indy Circuit | 1.93 | 1.5 |
| Circuit de Catalunya | GP Circuit | 4.67 | 3.7 |
| National Circuit | 3.10 | 2.5 | |
| Club Circuit | 1.73 | 1.4 | |
| Circuit de Spa-Francorchamps | 7.05 | 5.6 | |
| Circuit des 24 Heures | 13.63 | 10.9 | |
| Daytona International Speedway | Motorcycle Course | 4.47 | |
| Road Course | 5.77 | ||
| Speedway | |||
| Dubai Autodrome | Grand Prix Circuit | 5.41 | 4.3 |
| International Circuit | 4.35 | 3.5 | |
| Hill Circuit | 1.76 | 1.4 | |
| Oval Circuit | 1.14 | 0.9 | |
| National Circuit | 3.60 | 2.9 | |
| Club Circuit | 2.56 | 2.0 | |
| Formula E Hong Kong Circuit | |||
| Hockenheimring | Short | 2.61 | 2.1 |
| National | 3.71 | 3.0 | |
| Grand Prix Circuit | 4.57 | 3.7 | |
| Indianapolis Motor Speedway | Speedway | 4.03 | 3.2 |
| Road Course | 4.03 | 3.2 | |
| Mazda Raceway Laguna Seca | 3.60 | 2.9 | |
| Melbourne | 2.62 | 2.1 | |
| Mount Panorama | 6.22 | 5.0 | |
| Nürburgring | Grand Prix Circuit | 5.15 | 4.1 |
| Müllenbachschleife | 1.50 | ||
| Sprint Circuit | 3.63 | 2.9 | |
| Porsche Test Track | Dynamic Circuit | 2.25 | |
| On-road Circuit (Long) | 3.79 | ||
| On-road Circuit (Short) | 2.03 | ||
| Richmond International Raceway | 1.13 | ||
| Silverstone | The Grand Prix Circuit | 5.86 | 4.7 |
| The International Circuit | 2.99 | 2.4 | |
| The National Circuit | 2.65 | 2.1 | |
| The Bridge Grand Prix Circuit 2009 | 5.14 | 4.1 | |
| Suzuka Circuit | Grand Prix Circuit | 5.79 | 4.6 |
| East Circuit | 2.25 | 1.8 | |
| West Circuit | 3.45 | 2.8 |