TSI Supercool 27880 Universal Synthetic PAG Oil with U/V Dye 8-Ounces- Case of 12 is an advanced, high performance synthetic PAG oil that provides excellent resistance to moisture. This oil is specially formulated for aftermarket A/C systems using R134a refrigerant. It contains conditioners, inhibitors and anti-wear agents for excellent lubricity and compressor protection that helps reduce compressor wear. It meets OEM performance specifications. Supercool customers receive industry's leading technology in all fluids with lubricants and UV dye's formulated to meet or exceed OEM performance specifications. In addition, all lubricants are top-off compatible with their corresponding OEM and aftermarket equivalents. Designed for real-world operating conditions, they provide an unsurpassed level of service, performance, protection, and fluid life.