I just want to post my real world results of a young heng compressor after one year. I filled enough scba tanks to shoot 300 lbs of lead outta my 50 texan. Finally a huge vapor cloud of oil in the room and a different tone. I instantly shut it down and got on eBay and ordered a new piston both stages valve and head gaskets $35 from china. It was supposed to be a !month shipping but it came early. I had no expectations of the compressor working again lol I tore it down easily and the ring s were bad. The inside of.the heads were fine. Put the new piston valve and head gaskets . I also used permatex paper gasket sealer. Can't hurt. Let everything dry till morning. And to my surprise my compressor is working great again. The Chinese $230 young heng continues to amaze me.