1993 Oldsmobile 88 Owner's Manual - Page 249

Service & Appearance Care hflation-Tire Pressure The Tire-Loading Information label of which is on the rear edge the driver's door shows the correct inflation pressures for your tires, when they're cold. "Cold" means your vehicle has been sitting for at least three hours or driven no more than a mile. Don't let anyone tell you that underinflation or overinflation is all right. It's not.If your tires don't have enough air (underinflation), When to Check: Check your tires once a month more. or Don't forget your compact spare tire. It should be at psi (420 k a . 60 p) How to Check: Use a good quality pocket-type gage to looking at check tire pressure. Simply the tires will not l you the pressure, tl e especially if you have radial tiresif which may look properly inflated even they're underinflated. If your tires have valve caps, sure to be put them back on. They help prevent leaks by keeping out dirt and moisture. 248