How to Control Oil Carry-Over in Reciprocating Compressors
Seeing oil in your air lines or tools? That’s a classic sign of oil carry-over. And it can create a mess, damage downstream equipment, and ruin end products. Luckily, most causes can be fixed yourself with a few checks and the right parts.
Worn Piston Rings
Worn piston rings allow oil to sneak past and enter the compressed air stream.
- Watch for excessive oil in discharge air or increased oil consumption.
- Replace with new piston rings to restore proper sealing and keep oil where it belongs.
Overfilled Oil Reservoir
Too much oil in the crankcase can lead to excess oil vapor being carried into the air lines.
- Check your oil level and drain if above the recommended mark.
- Refill with the correct compressor oil at the proper level.
Restricted or Dirty Air Intake Filters
A clogged intake forces your compressor to work harder, pulling more oil past seals and rings.
- Inspect filters for dirt and blockage.
- Replace as needed — shop our air filters for easy swaps.
Worn Bearings or Seals
Bad bearings or seals can lead to improper clearances, increasing the chance of oil migration.
- Listen for unusual noises or feel for excess vibration.
- Replace with quality bearings or seals to keep your system tight.
High Operating Temperatures
Running too hot increases oil vaporization, which can get carried over into the air stream.
- Check for proper ventilation and clear cooling fins.
- Use the right viscosity compressor oil to minimize vaporization.
Keep Your Air Clean and Your Compressor Healthy
Controlling oil carry-over isn’t just about keeping lines clean. It’s about protecting tools, products, and your compressor’s long-term health. With a few DIY fixes and the right parts, you can handle it yourself and stay up and running.