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    Compressor Oil

    AMSOIL Compressor Oil — Synthetic Air Compressor Lubricant for Rotary Screw, Reciprocating & Vane Compressors

    AMSOIL Synthetic Compressor Oil is the best synthetic air compressor lubricant for rotary screw, reciprocating, vane, and scroll compressors. Available in ISO 32, 46, 68, and 100, it delivers up to 8,000-hour drain intervals — roughly 8x conventional petroleum oil — with dramatically reduced carbon and varnish deposits.

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    Why Run AMSOIL Synthetic Compressor Oil?

    • Up to 8,000-hour drain interval — approximately 8x conventional
    • Dramatically reduces carbon and varnish deposits
    • PAO-based synthetic chemistry — high flash point (500°F+)
    • Premium anti-wear, anti-foam & anti-oxidation additives
    • Lowers operating temperatures vs. petroleum oils
    • Extends separator-element life in rotary screw service
    • Compatible with most petroleum & synthetic compressor oils
    • Full ISO range — 32, 46, 68, 100 & 150

    Product Lineup

    Shop AMSOIL Compressor Oils

    Synthetic air compressor lubricant in every ISO viscosity grade your shop or plant needs — from ISO 32 light-duty rotary screw service through ISO 100 heavy reciprocating duty — plus AIRBA air-tool oil and SIROCCO ISO-32/46.

    Shop AMSOIL ISO 32 100% Synthetic Compressor Oil (PCH)
    AMSOIL AMSOIL ISO 32 100% Synthetic Compressor Oil (PCH)

    AMSOIL ISO 32 100% Synthetic Compressor Oil (PCH)

    Premium PAO-based synthetic ISO 32 compressor oil engineered for rotary screw and reciprocating air compressors. Outstanding deposit control and extended drain capability — up to 8,000 hours in rotary screw service.

    Fitment:

    • • Rotary screw, reciprocating, vane compressors
    • • Light-grade for cooler operation

    Specs:

    • • ISO viscosity grade 32
    • • Up to 8,000-hour drain interval (rotary screw)
    • • Increases compressor efficiency
    • • Controls foam, reduces wear & resists water contamination

    Product Code: PCH

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    Shop AMSOIL ISO 46 100% Synthetic Compressor Oil (PCI)
    AMSOIL AMSOIL ISO 46 100% Synthetic Compressor Oil (PCI)

    AMSOIL ISO 46 100% Synthetic Compressor Oil (PCI)

    The most popular grade for rotary screw compressors and high-pressure reciprocating units. Engineered to dramatically reduce carbon and varnish deposits that plague conventional compressor oils.

    Fitment:

    • • Rotary screw compressors (most common grade)
    • • Reciprocating, vane compressors

    Specs:

    • • ISO viscosity grade 46
    • • Up to 8,000-hour drain interval
    • • Excellent thermal & oxidative stability
    • • Controls foam and reduces wear
    • • Resists water contamination

    Product Code: PCI

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    Shop AMSOIL ISO 68 100% Synthetic Compressor Oil (PCJ)
    AMSOIL AMSOIL ISO 68 100% Synthetic Compressor Oil (PCJ)

    AMSOIL ISO 68 100% Synthetic Compressor Oil (PCJ)

    Heavier ISO 68 synthetic compressor oil for high-temperature reciprocating and rotary applications. Ideal for hot industrial environments and high-discharge-pressure duty.

    Fitment:

    • • Reciprocating compressors, hot environments
    • • High-discharge-pressure rotary screw

    Specs:

    • • ISO viscosity grade 68
    • • Up to 8,000-hour service life
    • • Resists oxidation, varnish & sludge
    • • PAO-based synthetic chemistry

    Product Code: PCJ

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    Shop AMSOIL ISO 100 100% Synthetic Compressor Oil (PCK)
    AMSOIL AMSOIL ISO 100 100% Synthetic Compressor Oil (PCK)

    AMSOIL ISO 100 100% Synthetic Compressor Oil (PCK)

    Heavy-grade ISO 100 synthetic compressor oil for severe-duty reciprocating compressors and high-temperature industrial applications. Premium anti-wear and anti-foam additive package.

    Fitment:

    • • Severe-duty reciprocating compressors
    • • Industrial high-temp applications

    Specs:

    • • ISO viscosity grade 100
    • • Premium anti-wear & anti-foam additives
    • • High flash point for hot-environment safety
    • • Extended drain capability

    Product Code: PCK

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    Shop AMSOIL 100% Synthetic Air Tool Oil (AIRBA)
    AMSOIL AMSOIL 100% Synthetic Air Tool Oil (AIRBA)

    AMSOIL 100% Synthetic Air Tool Oil (AIRBA)

    Outstanding air tool protection and performance. Effectively lubricates rotary- and piston-type air-tool bearings and motors, manages moisture, and conditions rubber and plastic seals and O-rings.

    Fitment:

    • • Rotary- and piston-type air tools
    • • Pneumatic motors and bearings

    Specs:

    • • Manages moisture in air-tool service
    • • Conditions rubber & plastic seals and O-rings
    • • Reduces wear — helps tools last for years
    • • Available in 4 oz. bottle

    Product Code: AIRBA

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    Shop AMSOIL SIROCCO® ISO-32/46 Compressor Oil (SEI)
    AMSOIL AMSOIL SIROCCO® ISO-32/46 Compressor Oil (SEI)

    AMSOIL SIROCCO® ISO-32/46 Compressor Oil (SEI)

    SIROCCO synthetic compressor oil with excellent demulsibility — eliminates oil/water emulsions. Superior resistance to sludge, carbon, and varnish deposits in rotary screw and reciprocating compressors.

    Fitment:

    • • Rotary screw & reciprocating compressors
    • • Humid environments — superior demulsibility

    Specs:

    • • ISO viscosity grades 32 & 46
    • • Excellent demulsibility — separates from water
    • • Resists foam, heat & oxidation
    • • Lasts up to 8,000 hours

    Product Code: SEI

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    Viscosity Selector

    What Type of Oil Does an Air Compressor Use?

    Always check the OEM nameplate first. ISO 46 is the most common grade for rotary screw compressors; ISO 68 and ISO 100 are typical for heavy reciprocating units.

    ISO GradeTypical CompressorAMSOIL Product
    ISO 32Cool-running rotary screw, light reciprocating, vanePCH
    ISO 46Rotary screw compressors (most common grade)PCI
    ISO 68Hot-environment rotary screw, mid-pressure reciprocatingPCJ
    ISO 100Severe-duty reciprocating, high-temp industrialPCK
    ISO 32/46 (humid)Humid environments needing demulsibilitySIROCCO SEI

    Who Uses Compressor Oil?

    Compressed air powers nearly every industry. AMSOIL synthetic compressor oil ships nationwide to operators in:

    Auto Shops & Body Shops

    Reciprocating and rotary screw compressors driving air tools, lifts, and spray painting. PCI is the workhorse grade.

    Manufacturing Plants

    Plant-air systems running rotary screw compressors 24/7. Extended drains cut maintenance touches and downtime.

    HVAC Contractors

    Service trucks and shop compressors. Synthetic chemistry lowers operating temps in summer heat.

    Dental & Medical Offices

    Oil-flooded medical-air compressors require clean, deposit-free lubrication for compressed-air quality.

    Spray Painting & Finishing

    Clean-air output is critical. Reduced varnish in PCI helps separator efficiency.

    Pneumatic Tool & Construction

    Tow-behind and stationary compressors in rough service. PCJ and PCK handle heat and pressure.

    The Complete Guide to AMSOIL Synthetic Compressor Oil

    Can I use synthetic oil in a rotary screw compressor?

    Yes — synthetic compressor oil is the preferred choice for rotary screw compressors. AMSOIL PCI (ISO 46) is engineered specifically for rotary screw service, delivering extended drain intervals, dramatic deposit reduction, lower operating temperatures, and longer separator-element life than petroleum compressor oils.

    How often should compressor oil be changed?

    AMSOIL Synthetic Compressor Oil supports service intervals up to 8,000 hours in rotary screw service — approximately 8x conventional petroleum oil's typical 1,000-hour life. Actual interval depends on duty cycle, ambient temperature, humidity, and intake-air contamination; pair with quality filters and oil analysis for maximum life.

    Why deposit control matters in compressor oil

    The biggest enemy of any air compressor is varnish and carbon. As petroleum oil oxidizes under heat and pressure, it forms deposits that clog separator elements, reduce cooling efficiency, raise operating temperatures, and ultimately cause premature wear. AMSOIL synthetic compressor oils resist oxidation dramatically better than petroleum — keeping rotors, vanes, valves, and bearings clean across the entire drain interval.

    Reciprocating vs. rotary screw — different grades for different jobs

    Rotary screw compressors typically run cooler and at lower pressures with continuous oil circulation — ISO 32 or ISO 46 (PCH, PCI) is the right call. Reciprocating compressors run hotter at the cylinder, see splash or pressure-fed lubrication, and benefit from heavier viscosities — ISO 100 (PCK) for severe duty. Vane and scroll compressors usually fall in the ISO 46 to ISO 68 range.

    Compressed-air quality and your oil choice

    Every drop of oil in an oil-flooded compressor passes through the air/oil separator. Oil that varnishes plugs separator media, raises pressure drop, and forces more oil carryover into the discharge air. For dental, medical, food-grade, and spray-painting applications where downstream air quality matters, the deposit control of AMSOIL synthetic compressor oil directly improves system performance and air purity.

    Compressor Oil — Frequently Asked Questions

    What is the best synthetic compressor oil?▾
    AMSOIL Synthetic Compressor Oil is widely regarded as the best synthetic air compressor lubricant for rotary screw, reciprocating, and vane compressors. PCI (ISO 46) is the most-used grade and delivers up to 8,000-hour drain intervals — roughly 8x conventional petroleum compressor oil — with dramatically reduced carbon and varnish deposits.
    What type of oil does an air compressor use?▾
    Most air compressors use an ISO-grade compressor oil — typically ISO 32, 46, 68, or 100 depending on the compressor type and operating temperature. Always check the OEM nameplate; rotary screw compressors most commonly call for ISO 46 (AMSOIL PCI), while heavier reciprocating units use ISO 100 (AMSOIL PCK).
    Can I use synthetic oil in a rotary screw compressor?▾
    Yes — synthetic compressor oil is the preferred choice for rotary screw compressors. AMSOIL PCI (ISO 46) is engineered specifically for rotary screw service, delivering extended drain intervals, reduced carbon deposits, lower operating temperatures, and longer separator-element life compared to petroleum compressor oils.
    How often should compressor oil be changed?▾
    AMSOIL Synthetic Compressor Oil is engineered for service intervals up to 8,000 hours in rotary screw compressors — approximately 8x conventional petroleum compressor oil's typical 1,000-hour life. Actual interval depends on duty cycle, ambient temperature, humidity, and intake-air contamination; pair with quality filters and oil analysis for maximum life.
    Will synthetic compressor oil work in my reciprocating compressor?▾
    Yes. AMSOIL Synthetic Compressor Oil performs in reciprocating, rotary screw, vane, and scroll compressors. Match the ISO viscosity grade to your OEM spec — PCH, PCI, PCJ, or PCK (plus AIRBA air-tool oil and SIROCCO SEI) — and you get the deposit-control and extended-drain benefits of synthetic chemistry.
    Is AMSOIL compressor oil compatible with my current oil?▾
    AMSOIL Synthetic Compressor Oil is compatible with most other petroleum and synthetic compressor oils. For best results and full extended-drain capability, drain the existing oil, change the separator and filters, and refill with AMSOIL rather than topping off with mixed fluids.
    What does compressor oil do?▾
    Compressor oil lubricates moving parts (rotors, vanes, pistons, bearings), seals compression chambers for higher efficiency, transfers heat away from the compression element, and prevents corrosion. In rotary screw compressors it also passes through the air/oil separator, so deposit control and oxidation resistance directly affect compressed-air quality.

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