Department Of Transportation Uniform Tire Quality Grades

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:

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Engine Oil Viscosity
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Operating Tips
NOTE: Refer to the chart at the end of this section for suggested control settings for various weather conditions. ...