Please Note: *Please make sure the installation site is clean. Or, it will cause operating obstruction, even make the temperature of the compressor very high, and the belt on the clutch may melt. *Because the item is with oil when sent to you, so there is no need to add oil when you use it the first time. But you need to add the refrigerant , please add about 500g, don't need to fill up. There may be noise if the refrigerant is added too much. Package Includes: 1 x Air Conditioner Compressor W/ Clutch NOTE:The pulley of the Air conditioner compressor is a 5 Groove .If your car is a six Groove,it is not fit. When you receive this compressor item, please first check if there is any damage to the compressor, and then manually rotate the wheels and suction blades to see if there are any abno.