You're welcome, friend, but if it goes straight only because of the low compressor input. Although that oil is constantly circulating throughout the entire circuit of pipes, but ideally throughout the low inlet, some compressors will bring a plug to put it in the same way as the screw type car engine. you should do a good cleaning of the entire system too and check if the pencil valve or expansion valve in any case you should check that it is not clogged.