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TSI Supercool 16600 A/C 134a Charge and Ester Lube - 3-Oz. offers a quick and easy way to add oil charge to R134a A/C systems. The premium quality, synthetic formula blends 2-Oz. Ester Oil Charge with 1-Oz. R-134a Refrigerant, and is proven to reduce compressor wear. Our unique formula blends an O-ring conditioner with our proprietary Anti-Wear and Anti-Oxidant additives. Each can contains enough formula to treat one vehicle. Professionals worldwide trust TSI Supercool Quality Products and Great Service Standards.