What size wrench is needed to take off caliper bolt on a Oldsmobile 98 1989?

The size of the caliper bolt wrench for a 1989 Oldsmobile 98 will likely be either 13mm or 14mm. However, there's no guarantee without checking the car itself. It's best to:

1. Consult a repair manual: A repair manual specific to your 1989 Oldsmobile 98 will definitively state the correct size.

2. Look at the bolt: If you can safely access the caliper bolts, you can measure them with a wrench or caliper to determine the size.

3. Use a socket set: Starting with either a 13mm or 14mm socket will allow you to quickly determine the correct size. It's safer to use sockets than open-ended wrenches as they are less likely to slip.

Don't assume; always double-check before you start working on your car.