Lubricating Oil for Atlas Copco Oil-Free Air Compressor

Atlas Copco 2908850101 Roto Z Fluid 20L

Atlas Copco 2908850101 Roto Z Fluid is a specially formulated compressor lubricant developed for Atlas Copco oil-free screw compressors.

This 20-liter lubricant uses a mineral-based formulation with a tailored additive package to meet the lubrication requirements of Atlas Copco Z compressor systems. It is designed for compatible ZR, ZS, ZT, ZA and ZE compressors and is intended to provide reliable lubrication and protection under demanding industrial operating conditions.

Unlike lubricants intended for oil-injected rotary screw compressors, Roto Z Fluid is specifically associated with Atlas Copco’s oil-free screw compressor range. Selecting the correct lubricant is therefore important when servicing Z-series equipment.

Product Specifications

Item	Specification
Brand	Atlas Copco
Product Name	Roto Z Fluid
Part Number	2908850101
Formatted Part Number	2908 8501 01
Product Type	Compressor Lubricant
Oil Type	Mineral-based oil with tailored additive package
Package Size	20 L
Equipment	Atlas Copco oil-free screw compressors
Compatibility	ZR, ZS, ZT, ZA, ZE compressors
Ambient Temperature Range	0°C to 50°C
Service Interval	8,000 h below 55 kW
Service Interval	16,000 h above 55 kW

The service intervals are Atlas Copco’s published specifications and should be interpreted together with the maintenance requirements for the specific compressor.

Developed for Atlas Copco Z Compressors

Roto Z Fluid is designed around the requirements of Atlas Copco’s Z-series compressor technology.

The lubricant is used within the compressor’s lubrication system to help protect relevant lubricated components during operation. Its formulation combines a mineral base oil with a specially selected additive package.

Atlas Copco identifies Roto Z Fluid for:

• ZR oil-free screw compressors
• ZS screw compressors
• ZT oil-free screw compressors
• ZA compressors
• ZE compressors

The current Atlas Copco product page lists ZR, ZT, ZA and ZE, while the official Roto Z Fluid specification sheet also includes ZS in the compatibility range.

Technical Characteristics

Atlas Copco’s Roto Z Fluid specification sheet provides the following typical lubricant characteristics:

Property	Typical Value	Test Method
Appearance	Light brown	—
Density at 15°C	0.860 kg/dm³	ISO 3675
Viscosity at 40°C	68 mm²/s	ASTM D445
Viscosity Index	133	ASTM D2270
Foam Stability	0/0/0 ml	ASTM D892
Total Acid Number	0.18 mg KOH/g	ASTM D974
Rust Test	Pass	ASTM D665B
Pour Point	-30°C	ASTM D97

Atlas Copco notes that these values are typical characteristics of current production and may vary within the manufacturer’s specification.

Applications

Typical applications include:

• Industrial compressed-air systems
• Manufacturing plants
• Automotive production
• Electronics manufacturing
• Food and beverage production
• Pharmaceutical production
• General industrial applications
• Continuous-duty compressor installations

The specific compressor model should be verified before use, particularly where multiple lubricant specifications are available.

Maintenance Considerations

Correct lubricant selection should be part of the compressor maintenance process. Before replacing the lubricant, confirm:

1. Compressor model
2. Compressor serial number
3. Existing lubricant specification
4. Required lubricant quantity
5. Recommended service interval
6. Operating temperature and environmental conditions

Avoid mixing different lubricant types unless compatibility has been confirmed by Atlas Copco or the applicable technical documentation.

For older machines, upgraded or superseded lubricant references may also exist. Checking the machine serial number before ordering can help ensure that the correct current part number is supplied.