1993 Buick Roadmaster Owner's Manual - Page 275

When to Check: Check your tires once month or .a more. Don't forgetyour compact spare-tire(if SO equipped). It should be at psi (420 P a ) . 60 Tire Inspection and Rotation To make your tires last longer, have them inspected and rotated at the mileages recommended in the, Maintenance Schedule. See "Scheduled Maintenance Services" in the Index. How to Check: Use a good quality pocket-type gage to check tire pressure. Simply looking at the tires will not you tell you the pressure, especially if have radial tires - which may look properly inflated eventhey're if underinflated. If your tires have valve caps, be sure to put them back .on. They help prevent leaks by keeping dirt and out moisture. Use this rotation pattern. 273