a/c compressor gpd compressors are 100% leak tested with helium spectrometers. A 200,000 mile durability test is performed on every new compressor design. All 65 series compressors come with the proper amount of oil inside of the compressor for each application. designed to meet or exceed oe fit, form, and function durability tested on every new design 100% leak tested with helium spectrometers all 65 series compressors come pre-filled with the proper amount of oil