Piston Type Compressor Oil

Performance Standard

  • Prolonged service intervals
    Allows the interval between valve and piston maintenance to be extended. Compressors can be kept in service for much longer periods, operating at a consistently high level of efficiency.
  • Safe airlines
    In discharge airlines, the combination of rust particles dispersed in carbonaceous deposits, coupled with heat from recently compressed air, can cause an exothermic reaction leading to the possibility of fires and explosion. Byco Compress-P helps to minimize the likelihood of this danger arising.
  • Very good oxidation resistance
    Resistance to the formation of carbon deposits and lacquer on valves and piston crowns, caused by the by-products of corrosion, such as ferric oxides and hydroxides, at high working temperature and pressures. Such deposits can cause serious damage, lower compress efficiency and increase maintenance costs.
  • Very good rusting and wear protection
    Effectively protects all metal surfaces from corrosion. Protects all sensitive machinery parts, e.g. housing, valves, bearings, from wear and prolongs the service intervals.
  • Very good air release and anti-foam properties
    The careful choice of additives ensures rapid air release without excessive foaming.
  • Very good water separation properties
    Byco Compress-P separates readily from water allowing excess water to be drained from the oil circulation system, thus preventing accelerated corrosion and a reduction in lubrication efficiency. This also helps separators and drier units.


  • ISO 6743-3A-DAH
  • Good seal compatibility
    Byco Compress-P is compatible with all sealing materials commonly used in air compressors.
  • Low temperature performance
    For easy start-up at low temperature.
  • Yellow metal passivation
    Corrosion protection and longer component life.
  • Hydrolytic stability
    Prolongs oil life in moist condition.


  • Reciprocating Air Compressors
    Industrial reciprocating air compressors operating with air discharge temperatures of up to 220°C.
  • Breathing Air Compressors
    Byco Compress-P may be used in breathing air compressors, provided subsidiary clean-up apparatus is used to ensure that the air produced is fit for breathing.

Key Properties

ISO Viscosity Grade 68 100 150 Test Method
Performance Standard VDL 68 VDL 100 VDL 100 -
Kinematic Viscosity mm²/s@40°C 68 100 150 ASTM D-445
Kinematic Viscosity mm²/s@100°C 7.8 9.2 12.1 ASTM D-445
Flash Point°C 235 235 240 ASTM D-92
Pour Point°C -30 -33 -30 ASTM D-97
Acid Number mg/KOH/g 0.3 0.3 0.3 ASTM D-974
Sulphated Ash Mass% 0.06 0.06 0.06 ASTM D-874
Rust Prevention (Steel) Pass Pass Pass ASTM D-665 B
Water Separability@54°C (minutes) 30 - - ASTM D-1401
@82°C (minutes) - 20 20 ASTM D-1401

Note: The typical characteristics are given as a guide only and may vary according to latest production according to ISO.