1993 Cadillac DeVille Owner's Manual - Page 321

How to Check Use a good quality pocket-type gage to check tire pressure. Simply looking at the tires not tell you the pressure, will especially if you have radial tires -- which maylook properly inflated even if they're underinflated. If your tires have valve caps,be sure to put them back on. They help prevent leaks by keeping out dirt andmoisture. Tire Inspectionand Rotation To make your tires last longer, have them inspected and rotated at the mileages recommended in your Maintenance Schedule. See "Scheduled Maintenance Service" in the Index. FRONT Use this rotation pattern. After the tireshave been rotated, adjust the frontand rear inflation pressure as shown on the Tire-Loading Information label. Make certain that all wheel nuts are properly tightened. See "Wheel Nut Torque" in the Index.