Mineral-based lubricants are used in which type of mobile AC system?

Mineral-based lubricants are primarily used in traditional mobile air conditioning (AC) systems that utilize refrigerants like R-12 or R-134a. These lubricants are compatible with the mineral oils used in the compressors of older vehicles. However, many modern systems now use synthetic lubricants, especially those that operate with newer refrigerants such as R-1234yf. It's essential to use the correct lubricant type to ensure optimal performance and avoid damage to the AC system.