This product requires that you use ALL NEW air conditioning service tools or tools that have been used only with HYBRID cars or cars with electric compressors using hybrid 'dielectric" compressor oil.ANY amount of conductive PAG or Ester oil residue from any tool will contaminate an electric compressor.I suspect that the company that "cans" this product purchases the oil from the same original supplier as Nippondenso, Toyota, or Honda and offers at one tenth the price that dealers mark up the retail price.Must be used with a NEW or dedicated oil injector, purged of air and mixed with R-134a refrigerant attached to a manifold gauge set.. A vacuum pump. charging guages and a costly oil injector that must be used only with hybrid cars.Used improperly, this product can result in major damage and a very expensive repair costing thousands of dollars.Used properly, this product can save a great deal of money.