Nu-calgon NUCAL-4304-07 Refrigeration Oil 300 Sus 1 Gal

Product Description

The NU-CALGON NUCAL-4304-07 is a naphthenic mineral refrigeration oil formulated to lubricate moving parts inside air conditioning and refrigeration compressors. Rated at 300 SUS viscosity, this is the C-4s grade in the Nu-Calgon mineral oil lineup, which spans C-3s at 150 SUS, C-4s at 300 SUS, and C-5s at 500 SUS. The oil is engineered to remain miscible with refrigerant while retaining its lubricant properties across elevated operating temperatures. It is packaged in a 1-gallon container, making it suitable for shop stocking or service fleet use. HVAC and refrigeration technicians rely on this oil for compressor lubrication in systems requiring a mineral-based lubricant.

This refrigeration oil is intended for use in air conditioning and refrigeration compressors where a naphthenic mineral oil is specified. The 300 SUS viscosity grade suits a range of compressor types common in residential and light commercial refrigeration and cooling equipment. Technicians servicing older systems or equipment with mineral-oil-compatible refrigerants will find this viscosity grade a standard fit for compressor lubrication requirements. It is designed to deliver long-term, low-maintenance performance for the service life of the unit.

Key Features

• 300 SUS viscosity rating — mid-range grade in the Nu-Calgon C-series mineral oil lineup
• Naphthenic mineral oil base formulated for refrigeration and air conditioning compressor lubrication
• Miscible with refrigerant while retaining lubricant properties under operating conditions
• Engineered for long service life at elevated compressor temperatures without maintenance intervention
• Packaged in a 1-gallon container for convenient shop or field use

Compatibility

Designed for use in air conditioning and refrigeration compressors that specify a naphthenic mineral refrigeration oil. Verify the compressor manufacturer's viscosity and oil-type requirements before use.

Installation Notes

Adding or replacing compressor oil is typically performed by a licensed HVAC or refrigeration technician. Before servicing the refrigerant circuit or compressor, recover refrigerant in accordance with EPA Section 608 requirements and de-energize the system. Use only the oil type and viscosity grade specified by the compressor manufacturer. Mixing mineral oil with synthetic or POE lubricants can degrade lubricant performance and damage the compressor.

Technical Specifications

• Oil Type: Naphthenic Mineral Refrigeration Oil
• Viscosity Grade: 300 SUS (C-4s)
• Volume: 1 gallon

Standard Information

• Brand: NU-CALGON
• Manufacturer Part Number: NUCAL-4304-07