1998 Oldsmobile Achieva Owner's Manual - Page 268

Buying New Tires To find outwhat kind and size of tires you need, look at the Tire-Loading Information label. The tiresinstalled on your vehicle when it was new had a Tire Performance Criteria Specification(TPC Spec) number on each tire's sidewall, When you get new tires, get ones with that same TPC Spec number. That way your vehicle will continue to have tires thatare designed to give proper endurance, handling, speed rating, traction, ride and other things during normal service on your vehicle. If your tires havean all-season tread design, the TPC number will be followed by an "MS" (for mud and snow). If you ever replace your tires with those not having a TPC Spec number, make surethey are the same size, load range, speed rating and construction type (bias, bias-belted or radial) as your original tires. Mixing tires could cause you lose control while to driving. If you mix tires of different sizesor 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 sure to use the same size and type tires on all wheels. It's allright to drive with your compact spare, though. It was developed for use on your vehicle. If you usebias-ply tires on your vehicle, the wheel rim flanges could develop cracks after many milesof driving. A tire and/or wheel could fail suddenly, causing crash. Use only radial-ply a tires with the wheels your vehicle. on 6-40