* Tire size: The sticker on the driver's side doorjamb (or inside the glove box) will list the recommended tire size(s) for your car. Different tire sizes require different pressures.
* Tire type: Are they all-season, summer, winter, or performance tires? The tire sidewall will list the maximum pressure.
* Load: Are you carrying passengers or cargo? Heavier loads require slightly higher pressure.
Where to find the correct information:
1. Driver's side doorjamb sticker: This is the most reliable source. It will specify the recommended tire pressure for your vehicle's original tire size.
2. Tire sidewall: The maximum pressure for each tire is printed on the sidewall. Never exceed this number. The recommended pressure from the doorjamb is usually *lower* than the maximum.
3. Owner's manual: Your owner's manual should also list the recommended tire pressures.
In short: You *must* check your driver's side doorjamb sticker or your owner's manual to find the correct tire pressure for *your specific* 1989 Cadillac Eldorado. Using the incorrect pressure can affect handling, fuel economy, and tire wear.
