Why do I have compressor oil in my airstream/oil carryover?

There are a number of reasons why compressor oil may be carrying over into the air stream, with the most common being:

• Compressor oil too full.
  • VMAC compressor oil is clear when new which can sometimes make it difficult to read the oil level in the sight glass. Ensure the compressor has not been over filled. 
• Incorrect compressor oil.
  • Use only VMAC high performance synthetic oil.
• Incorrect shutdown procedure.
  • Follow the shutdown procedure documented in the owner's manual.
• Internal VMAC system pressure is being allowed to drop below 60 psi.
  • Ensure the compressor is sized correctly for tool (is compressor cfm adequate to run the tool)
• Lack of service, coalescing filter compromised.
  • Refer to the VMAC Owner's Manual for servicing intervals.
• Poor fit between the coalescing filter and the AOST. 
  • When servicing, ensure the coalescing filter is seated correctly.
• Clogged or kinked scavenge line.
  • Clear the scavenge tube of any blockages or restrictions. 
• Air Oil Separator Tank is not correctly aligned (VMAC UNDERHOOD^TM systems only).
  • Ensure the arrow on the blowdown cap is pointing up.
• System is being used on too steep an angle (All systems that utilize an Air Oil Separator Tank).
  • Ensure the system is level (15° or less).
• Blowdown cap scavenging line suction port is restricted by scavenge screen spring.
  • Rotate spring so the flat surface of the spring winding is not covering the suction port.
  • See Blowdown Cap Operation and Troubleshooting (vmacair.com) to identify screen and spring.