1998 Oldsmobile 88 Owner's Manual - Page 268

I A CAUTION: Mixing tires could cause to lose control while you driving. If you mix tires of different sizes or types (radial and bias-belted tires), the vehicle may not handle properly,and you could have crash. a Using tires of different sizes may also cause damage to your vehicle. Be to use the same sure size and type tires on allwheels. It's allright to drive with your compact spare, though. It was developed for use on your vehicle. Uniform Tire Quality Grading I I The following information relates the system to developed by the United States National Highway by Traffic Safety Administration, which grades tires treadwear, traction and temperature performance. (This applies onlyto vehicles soldin the United States.) The grades are molded on the sidewalls most passenger of car tires. The Uniform Tire Quality Grading system does not apply to deep tread, winter-type snow tires, space-saver or temporary use spare tires, tires with nominal rim diameters of 10 to 12 inches (25 to 30 cm), or to some limited-production tires. While the tires available on General Motors passenger cars andlight trucks may vary with respect to these grades, they must also conform Federal safety to requirements and additional General Motors Tire Performance Criteria (TPC) standards. If you use bias-plytires on your vehicle,the wheel rim flanges could develop cracks after many milesof driving. A tire and/or wheel could a fail suddenly, causing crash. Use onlyradial-ply tires with the wheels on your vehicle. 6-39