Product specification summary
- Catalog No. / MFR #
- COM-320-640
- Product
- Air Compressor Oil
- Catalog description
- Reciprocating compressor oil, mineral, 4,000 hour
- Viscosity grade
- ISO 320
- Base
- Mineral
- Size
- 5 gal

Mineral oil for reciprocating compressors
COM-320-640 identifies Lubri-Loy's mineral-based reciprocating compressor oil in ISO 320 viscosity grade. This article covers the 5 gal size.
Check the compressor manufacturer's lubrication instructions before selecting an oil. The compressor type and required lubricant should match your equipment's requirements; a product name or viscosity grade alone does not establish suitability for every machine.
Understanding the catalog's 4,000-hour rating
The catalog description states Reciprocating Compressor Oil, Mineral, 4,000 Hour. That is the catalog-stated service rating for this oil.
Follow equipment documentation and maintenance guidance when planning oil changes. The catalog rating should not be treated as a universal oil-change interval for every compressor or operating condition.
Lubri-Loy quality, blended in the USA since 1949
Lubri-Loy has blended quality lubricants in the USA since 1949. This mineral reciprocating compressor oil is part of that continuing commitment to product quality.
Buy directly from Lubri-Loy through the COM-320-640 product page. Include the full catalog number, ISO 320 viscosity grade and 5 gal size when preparing an order or discussing your requirements.
View Lubri-Loy Air Compressor Oil ISO 320, Mineral, 5 Gal (COM-320-640) / COM-320-640
Frequently asked questions
What is COM-320-640?
COM-320-640 is Lubri-Loy Air Compressor Oil, a mineral-based reciprocating compressor oil in ISO 320 viscosity grade and a 5 gal size. Its catalog description states a 4,000-hour rating.
How can I buy this product from Lubri-Loy?
Open the matching Lubri-Loy product page. Use Add to cart or Buy now when available, or Request a quote for quote-only products. Direct orders include free shipping within the US.