What type of freon is used in a 1992 BMW?

The refrigerant used in a 1992 BMW will depend on the specific model and year of production, as different refrigerants were used over time. However, the original refrigerant used in most 1992 BMW models was R12, which is now an obsolete and banned substance due to its harmful effects on the environment.

To ensure you are using the correct and approved refrigerant for your 1992 BMW, it's best to refer to the vehicle's owner's manual or consult with an authorized BMW dealership or a qualified automotive AC service center. They can provide you with the exact refrigerant that was originally used and recommend any suitable replacements if needed.