Department Of Transportation Uniform TireQuality Grades

The following tire grading categories were established by the National Highway Traffic Safety Administration. The specific grade rating assigned by the tire’s manufacturer in each category is shown on the sidewall of the tires on your vehicle.

All passenger car tires must conform to Federal safety requirements in addition to these grades.

See also:

Starting procedure for petrol versions
1) Ensure that the handbrake is up. 2) Put the gear lever into neutral. 3) Press the clutch pedal fully down, without pressing the accelerator. 4) Turn the ignition key to AVV and let it go the mom ...

Conditions of use
Cold starting Frequent cold starting will not enable the engine to reach optimal running temperature. It follows, therefore, that consumption will be higher (from +15 to +30% in towns) as will th ...

Spark plugs
The cleanness and soundness of the spark plugs are very important for keeping the engine efficient and polluting emissions down. The appearance of the spark plug, if examined by an expert eyes, is ...