What type of refrigeration oil should I use for my screw compressor?

Screw compressors typically require POE (Polyol Ester) oils for HFC refrigerants like R134a and R407C, or mineral oils for HCFC systems like R22. The viscosity grade (usually ISO VG 32-68) depends on the compressor manufacturer's specifications. Brands like Bitzer recommend BSE series POE oils, while FUSHENG systems often use mineral oil formulations.

What is the difference between POE and mineral refrigeration oil?

POE (Polyol Ester) oils are synthetic lubricants designed for HFC refrigerants (R134a, R404A, R407C, R410A) and are hygroscopic, requiring careful moisture control. Mineral oils (MO) are petroleum-based, used with CFC and HCFC refrigerants (R22, R502), and are less expensive but incompatible with modern HFC systems. POE oils offer better thermal stability and miscibility with newer refrigerants.

How do I select the right refrigeration oil for a centrifugal chiller?

For centrifugal chillers, select oil based on the OEM specification (e.g., Trane OIL00037, York PureOil S), the refrigerant type (R123 low-pressure or R134a medium-pressure), and the required viscosity grade. Most modern centrifugal chillers use POE oils with ISO VG 32-68. Always verify compatibility with the chiller manufacturer's technical bulletin and ensure the oil meets the required pour point for your operating conditions.

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Home > Why Us

Why Partner With Us

Why Partner with Qishanr?

We are more than just a lubricant manufacturer. We are a technical partner committed to ensuring your refrigeration systems operate at peak efficiency with reliable, OEM-approved chemical solutions.

High Capacity

With an annual production exceeding 150,000 tons, we offer unmatched supply stability for industrial and commercial projects.

OEM Trusted

Quality guaranteed. Our formulations are approved by 12+ top HVACR industry brands for factory fill and retrofitting.

Global Reach

A proven exporter to 108+ countries, our logistics network ensures your products arrive on time, every time.

Technical Support

We provide end-to-end consultancy for oil selection and system application, tailored to your unique refrigeration requirements.

Technical & Service Excellence

Comprehensive Compatibility: Our QSL fluids are fully compatible with all mainstream HFC refrigerants (R-125, R-134a, R-143a, R-152a, R-404A, R-407C, R-410A, R-507A).
Superior Stability: Formulated for wide operating temperature ranges, our oils maintain chemical and thermal stability in extreme industrial conditions.
Efficiency Driven: Products designed specifically for wear protection and increased compressor service life.
Safety Compliance: Our lubricants are non-hazardous under 29 CFR 1910.1200, ensuring safer handling and transport.