Conoco Circulation Oil is a high-quality, rust-inhibited mineral oil specially developed for the lubrication of conveyor and crusher bearings in copper crushing mills.

Circulating Oil is available in two viscosity grades: ISO 150 and 320. It is formulated with high-quality paraffinic base oils and select additives to provide protection against rust and corrosion and resistance to foaming. It has excellent water-separating properties to minimize the formation of emulsions in circulating systems subject to contamination with large quantities of water, minerals, dirt and scale.
Unit of Measure


ISO Grade

N/A 150

Density @ 15.6 ºC (60 ºF)

N/A 0.882 g/cm³7.34 lbs/gal
Color1 N/A 2.5

Flash Point (COC)

N/A 277 ºC531 ºF

Pour Point

N/A -15 ºC5 ºF

Viscosity @ 40ºC

N/A 150 cSt

Viscosity @ 100ºC

N/A 14.7 cSt

Viscosity @ 100ºF

N/A 788 SUS

Viscosity @ 210ºF

N/A 78.5 SUS

Viscosity Index

N/A 97
Acid Number2 N/A 0.05 mg KOH/g
Demulsibility, Minutes to Pass3 N/A 5
Foam Test4 N/A Pass
Rust Test5 N/A Pass



  • Ball mills, cement mills, hot and cold strip mills, plate mills
  • Conveyor bearings in mining applications
  • Plain and rolling-element bearings in ferrous and non-ferrous mills
  • Circulating systems where water contamination is a problem
  • Large, slow-speed bearings in mixers and mills



  • Excellent water-separating properties to minimize the formation of emulsions
  • Good oxidation resistance
  • Protects against rust and corrosion
  • Good foam resistance

Health and Safety Information

N/A For recommendations on safe handling and use of this product, please refer to the Material Safety Data Sheet via

Ordering Information

Package Type

N/A Bulk

Pricing Information

N/A Price/Gal

Shipping Note

N/A Shipping will be quoted upon receipt of your order.

  • 1 ASTM D-1500
  • 2 ASTM D-874
  • 3 ASTM D-1401
  • 4 ASTM D-892
  • 5 ASTM D-665 A&B