1993 Chevrolet Lumina Owner's Manual - Page 229

Tire Inspection and Rotation When to Check: Check your tires once a month or more. Don't forget your compactspare tire. It should be at 60 psi (420 kPa). How to Check Use a good quality pocket-type gage to check tire pressure. Simply lookingat the tires will not tell youthe pressure, especially if you haveradial tireswhich may look properly inflated even if they're underinflated. If your tires have valve caps, be to sure put them back on. They help prevent leaks by keeping out dirt and moisture. To make yourtires lastlonger, have them inspectedand rotated at the mileages recommendedin the Maintenance Schedule. See Index the under Scheduled Maintenance Services. Use this rotation pattern. M e r the tires have beenrotated, adjust the front and rear inflation pressure as shown onthe Tire-Loading Information label. Makecertain that all wheel nuts are properly tightened. See the Index under Wheel Nut Torque. I L Rust or dirt on a wheel, or on the parts to which it is fastened, can makethe wheel nuts a become loose after time. The wheel could comeoff and causean accident. When you changea wheel, remove anyrust or dirt from places wherethe wheel attaches to the vehicle. In anemergency, you can usea cloth or a paper towelto do this; but be sure to use a scraper or wirebrush later, you need to, if to get all the rust or off. (See dirt the Index under Changing a Flat Tire.)