Chevron Rando HDZ ISO 22 High Viscosity Index Hydraulic Oil
Antiwear ISO VG 22 Hydraulic Oil for Wide Temperature Operation
Chevron Rando HDZ ISO 22 is a high viscosity index (HVI) antiwear hydraulic oil designed for hydraulic and circulating oil systems that operate across varying temperatures. Its formulation combines antiwear additives, oxidation and corrosion inhibitors, foam and aeration suppressants, and a shear-stable viscosity index improver.
With a typical viscosity index of 160, Rando HDZ 22 is formulated to minimize viscosity changes as operating temperatures rise and fall. It is recommended for applications requiring an ISO VG 22 hydraulic fluid with wider temperature capability than a conventional single-viscosity-grade oil.
Key Benefits
- High viscosity index (160) for more consistent viscosity across changing temperatures
- Antiwear protection for hydraulic pumps and other system components
- Oxidation stability for high-pressure hydraulic service
- Rust and corrosion protection for copper and steel components
- Foam and aeration control to support consistent hydraulic operation
- Fast water separation to help remove water from the system
- Good filterability for hydraulic equipment with close tolerances
- Shear-stable formulation for multiviscosity performance
Where to Use Chevron Rando HDZ 22
Chevron Rando HDZ 22 is recommended for hydraulic and circulating oil systems that require a wider operating temperature range than a single-viscosity-grade hydraulic oil.
Applications can include:
- Mobile and stationary hydraulic systems
- Marine on-deck machinery
- Hydraulically actuated loading bins
- Hydraulic equipment exposed to changing operating temperatures
- Circulating oil systems requiring an ISO VG 22 high-viscosity-index fluid
Always confirm the required viscosity grade and performance specifications in the equipment manufacturer's service manual before use.
Why High Viscosity Index Matters
Hydraulic oil viscosity changes as temperature changes. If the oil becomes too thick at lower temperatures or too thin at higher temperatures, hydraulic response and component protection can be affected.
Rando HDZ 22 has a typical viscosity index of 160. Its multiviscosity formulation is designed to minimize viscosity change over a wide temperature range, supporting more consistent power transmission as operating conditions change.
Chevron also reports that Rando HDZ oils provided up to a 5% improvement in overall hydraulic pump efficiency in laboratory testing compared with a typical monograde hydraulic oil with a viscosity index below 105. Actual efficiency will depend on the hydraulic system, operating conditions, and fluid requirements.
Specifications and Performance Requirements
Chevron Rando HDZ ISO 22 meets the requirements of:
- ASTM D6158, HV
- DIN 51524-3
- ISO 11158 L-HV
Typical Properties
| Property |
Test Method |
Typical Value |
| ISO Viscosity Grade |
ISO 3448 |
22 |
| Kinematic Viscosity at 40°C / 104°F |
ASTM D445 |
22.5 cSt |
| Kinematic Viscosity at 100°C / 212°F |
ASTM D445 |
5.1 cSt |
| Viscosity Index |
|
160 |
| Flash Point |
|
370°F / 188°C |
| Pour Point |
|
-63°F / -53°C |
| Brookfield Viscosity at -20°C |
ASTM D2983 |
750 cP |
| Brookfield Viscosity at -30°C |
ASTM D2983 |
2,340 cP |
| Brookfield Viscosity at -40°C |
ASTM D2983 |
9,120 cP |
| Dielectric Strength* |
ASTM D877 |
35 kV |
*The typical 35 kV dielectric-strength value applies to clean, dry packaged product at the point of manufacture from a Chevron manufacturing facility. It does not apply to bulk packaging. Moisture and contamination can quickly reduce dielectric strength, and ASTM D877 test results can vary significantly.
Typical test data represent normal production. Minor variations may occur.
Frequently Asked Questions
What is Chevron Rando HDZ ISO 22 used for?
Chevron Rando HDZ ISO 22 is used in hydraulic and circulating oil systems requiring an ISO VG 22 high-viscosity-index antiwear hydraulic fluid. Chevron identifies applications including marine on-deck machinery, hydraulically actuated loading bins, and equipment requiring wider temperature capability than a single-viscosity-grade hydraulic oil.
Is Chevron Rando HDZ 22 a cold weather hydraulic oil?
Rando HDZ 22 is formulated for hydraulic systems operating across a wide temperature range. Its typical viscosity index of 160 and pour point of -63°F (-53°C) provide useful low-temperature characteristics, but the pour point should not be treated as the minimum safe startup or operating temperature. Equipment-specific viscosity requirements should determine fluid selection.
What does ISO VG 22 mean?
ISO VG 22 identifies the oil's viscosity grade. Chevron Rando HDZ 22 has a typical kinematic viscosity of 22.5 cSt at 40°C (104°F), which places it within the ISO VG 22 viscosity classification.
What is the viscosity index of Chevron Rando HDZ 22?
Chevron Rando HDZ 22 has a typical viscosity index of 160. A higher viscosity index means the oil experiences less viscosity change as temperature changes, which is useful in hydraulic systems exposed to varying operating temperatures.
What is the difference between Chevron Rando HD and Rando HDZ?
Chevron describes Rando HD as a straight-grade hydraulic oil, while Rando HDZ is a high-viscosity-index multiviscosity hydraulic oil. Rando HDZ is intended for applications where greater viscosity stability across changing temperatures is required.
Does Chevron Rando HDZ 22 meet DIN 51524-3?
Yes. Chevron Rando HDZ ISO 22 meets DIN 51524-3 requirements. It also meets ASTM D6158 HV and ISO 11158 L-HV requirements.
Can Chevron Rando HDZ 22 be used in vane, piston, and gear pumps?
Rando HDZ oils contain antiwear additives designed to minimize metal-to-metal contact. Chevron identifies this protection as particularly important in vane-, piston-, and gear-type hydraulic pumps. Always verify that ISO VG 22 is the correct viscosity grade for the specific pump and operating conditions.
What is the pour point of Chevron Rando HDZ ISO 22?
The typical pour point is -63°F (-53°C). Pour point measures low-temperature fluidity under a standardized test and does not establish the minimum operating or startup temperature of a hydraulic system.
Does Chevron Rando HDZ 22 have a 35 kV dielectric strength?
Chevron reports a typical dielectric strength of 35 kV under ASTM D877 for clean, dry packaged product at the point of manufacture. The value does not apply to bulk packaging and can decrease rapidly when the oil is exposed to moisture or contamination. Rando HDZ 22 should not be selected as an electrical insulating fluid based solely on this test value.
Was Chevron Rando HDZ formerly Texaco Rando HDZ?
Yes. Rando HDZ was previously marketed under the Texaco brand. When replacing an older Texaco Rando HDZ product, verify the required ISO viscosity grade and equipment specifications before use.
