# COM-320-640 ISO 320 Air Compressor Oil, 5 Gal

Date: 2026-11-02

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Compressor oils · 2026-11-02

[Buy direct from Lubri-Loy - free shipping: COM-320-640](https://lubriloy.com/products/com-320-640)

Lubri-Loy COM-320-640 is Air Compressor Oil in ISO viscosity grade 320 and a 5 gal size. The catalog describes it as reciprocating compressor oil, mineral, 4,000 hour. Lubri-Loy's commitment to product quality builds on lubricants blended in the USA since 1949. Buy directly from Lubri-Loy through the matching COM-320-640 product page.

[View Lubri-Loy Air Compressor Oil ISO 320, Mineral, 5 Gal (COM-320-640) / COM-320-640](https://lubriloy.com/products/com-320-640)

## 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](https://lubriloy.com/products/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.

Based only on the supplied COM-320-640 facts: Air Compressor Oil; mineral reciprocating compressor oil; ISO 320; catalog-stated 4,000-hour rating; 5 gal size; and Lubri-Loy quality lubricants blended in the USA since 1949.

[Matching product page](https://lubriloy.com/products/com-320-640) · [All product guides](https://lubriloy.com/blog/product-guides)

[Buy direct from Lubri-Loy - free shipping: COM-320-640](https://lubriloy.com/products/com-320-640)

Other ways to buy: [Also available on Motion](https://www.motion.com/products/sku/03496075)