This compressor was used by a police dive team and was running just fine when we took it out. They upgraded to a brand new system and trade this compressor in. It was running perfectly fine when we took it out. We serviced this compressor every 6 months and took air tests every 3 months. We had no problems with this machine and it never failed an air test. They only had it pump up to 3600PSI even though the block is capable of 5000PSI, so they never really pushed it to hard. The reason they only went to 3600PSI is because they only had 3600PSI DOT bottles for their storage. This system still has plenty of hours left in it because they took very good care of it.