Why the fluid matters
In an oil-injected compressor the lubricant is part of the compression process. It affects temperature, sealing, wear, oil carryover and the life of the separator and seals. The wrong fluid can shorten the life of the airend and cause varnish, foaming or seal damage.
Identify the fluid
To confirm the right lubricant:
- Compressor make, model and serial number
- The fluid currently in the machine and its type
- Operating temperature, ambient conditions and duty
- Whether the machine requires a specific approved fluid
Compatibility
Check these before changing fluids:
- Compatibility with seals, hoses and the separator element
- Compatibility and mixing with the existing fluid
- Whether a flush is needed when changing fluid type
- The manufacturer's service interval for that fluid
Do not mix without checking
Mixing different lubricants can cause foaming, varnish or seal problems. If you change fluid type, follow a verified procedure and check what remains in the circuit.
Before you order
Confirm the fluid specification and approval for your machine before ordering.
Ask for the supply status of the item: whether it is genuine, OEM-approved or an alternative, and whether it is in stock or must be sourced.
Check the lead-time basis and the warranty terms that apply.
Frequently asked questions
Can I use a general-purpose oil?
Only if it meets the specification for your machine. Compressor fluids are designed for a specific duty and a general oil may not be suitable.
How often should the lubricant be changed?
Follow the manufacturer's interval for the fluid and machine, and shorten it for hot, dusty or heavy-duty conditions. Oil analysis can help refine it.
Is a synthetic fluid always better?
It can offer longer life in demanding conditions, but it must be compatible with the machine and seals, and the benefit depends on the application.
Field guide
Compressor oils: the right fluid, changed at the right time
In an oil-injected screw compressor the oil seals, cools and lubricates the airend. In a piston compressor it lubricates the crankcase and, in lubricated designs, the cylinders. The wrong oil, or old oil, shortens the life of everything it touches.
| Sign | Likely cause |
|---|---|
| Oil darkening quickly, varnish deposits | Overheating, wrong oil, overdue change |
| Foaming or milky oil | Water contamination, mixed oils |
| High oil consumption, oil in air lines | Separator failure, overfilling, scavenge line blocked |
| Rising discharge temperature | Degraded oil, low level, cooler fouling |
Rules
- Use the oil type the manufacturer specifies for the machine and climate; mineral, semi-synthetic and synthetic oils are not freely interchangeable.
- Do not mix different oils. When changing type, drain completely and flush if required.
- Change by hours and by time, whichever comes first, and sooner in hot or dusty conditions.
- Change the oil filter and, at the specified interval, the separator together with the oil.
- Consider oil analysis on large or critical machines.
- Dispose of used oil and oily condensate responsibly.
What to send for a quotation
- Compressor make, model and serial number.
- Oil currently used (brand and type) and the oil capacity if known.
- Running hours and date of last change.
Send it through find my part or the spare parts enquiry, or call +91 99590 60718 or +91 92468 88812.