AMSOIL ISO 68 100% SYNTHETIC COMPRESSOR OIL

AMSOIL PC Series ISO 68 Synthetic Compressor Oil delivers up to 8,000 hours of service life in rotary screw, rotary vane, centrifugal and reciprocating compressors, cutting maintenance frequency and waste oil disposal costs compared to conventional petroleum compressor oils. It is built on thermally stable synthetic base oils and fortified with non-detergent additives engineered for continuous high-temperature operation.

Compressors operate under punishing conditions. Discharge temperatures routinely reach 200°F or higher, accelerating oxidation that thickens oil, deposits varnish on internal surfaces and generates acids that corrode metal components. Moisture from compressed air condensation compounds the problem, forming emulsions that promote rust. Petroleum-based compressor oils break down quickly in this environment, leading to short drain intervals, unplanned downtime and expensive repairs.

SUPERIOR VARNISH RESISTANCE
Varnish buildup is one of the most common causes of compressor inefficiency and mechanical failure. In head-to-head testing, a leading competitor's ISO 46 synthetic compressor oil reached critical varnish potential after only 6,228 hours at 200°F discharge temperature, as measured by the Membrane Patch Colorimetry Test (ASTM D7843). AMSOIL PC Series Synthetic Compressor Oil continued to show ultra-low varnish potential after a full 8,000 hours under the same conditions. That resistance to varnish formation translates directly to cleaner valve plates, cooler operating temperatures and fewer service interruptions in industrial rotary screw compressor applications.

REDUCED OIL CONSUMPTION
Frequent top-offs waste time and lubricant. In an 8,000-hour side-by-side comparison run in an industrial rotary screw compressor under identical operating conditions, AMSOIL PC Series required 35% less top-off oil than the leading competitor's synthetic compressor oil. The excellent foam resistance and air-release properties of the PC Series formulation keep oil where it belongs rather than allowing it to be carried out with discharged air.

CONTROLS FOAM AND REDUCES WEAR
Foam in a compressor oil increases heat, accelerates oxidation and starves contact surfaces of lubrication. AMSOIL PC Series Synthetic Compressor Oil is formulated with anti-foam additives and delivers 0/0 foam results across all three sequences of ASTM D892 testing. Unlike some competing compressor oils, the PC Series is also anti-wear fortified. Four-Ball Wear Test results (ASTM D4172) show a 0.41mm wear scar at 40 kg load, protecting high-contact regions in vanes, screws and bearings.

RESISTS WATER CONTAMINATION
Water is unavoidable in compressed air systems. AMSOIL PC Series Oil is hydrolytically stable and separates rapidly from water, achieving complete demulsibility (40/40/0) in just 15 minutes per ASTM D1401 testing. Once separated, water can be easily drained from the sump. The formulation is also anti-rust fortified, passing both fresh water and synthetic sea water rust tests per ASTM D665 A and B.

HIGH FLASH POINT FOR IMPROVED SAFETY
Carbon deposits inside compressors can create hot spots that raise the risk of ignition. AMSOIL PC Series ISO 68 is an ashless formulation with very low carbon-forming tendencies and a flash point of 260°C (500°F) per ASTM D92. The fire point reaches 284°C (543°F). While it is not classified as a fire-resistant fluid, these properties provide a meaningful safety margin over conventional petroleum compressor oils.

APPLICATIONS AND COMPATIBILITY
AMSOIL PC Series ISO 68 Synthetic Compressor Oil (PCJ) is recommended for single and multistage rotary screw, rotary vane, centrifugal and reciprocating compressor crankcases and cylinders. It is also suitable for vacuum pumps, pressure washer pumps, gears, bearings, blowers and other industrial pump applications. For reciprocating compressors, the ISO 68 viscosity covers single-piston, single-stage vacuum pump applications.

PC Series Oil is compatible with PAO-based, ester-based and petroleum-based compressor oils. It is not compatible with polyalkylene glycol or silicone-based oils. It is not recommended for breathing air compressors or refrigeration compressors, or for use with polycarbonate plastic (unless metal covered), PVC plastic, or butyl, ethylene-propylene or SBR rubber.

SERVICE LIFE
In rotary compressor applications, AMSOIL PC Series ISO 68 provides up to 8,000 hours of service at 200°F discharge temperature. Actual drain intervals depend on operating conditions and maintenance practices. Oil analysis monitoring is recommended. For best results when converting from another compressor oil, flush the system of old oil, remove any carbon deposits per the compressor manufacturer's instructions and change all filters before installing PC Series Oil.