Frequently Asked

Q: What does API stand for?
A: American Petroleum Institute

Q: What does ISO stand for?
A: International Organization for Standardization

Q: What does NGLI stand form?
A: National Lubricating Grease Institute

Q: What does SAE stand for?
A: Society of Automotive Engineers

Q: What does VG stand for?
A: Viscosity Grade

Q: What does the W stand for in 5W-30?
A: Winter grade

Q: Does Chevron offer a mineral-based oil?
A: Mineral-based oil means that the oil is a petroleum-based product, so most of our products are mineral based.

Q: Where can I dispose of used passenger car motor oil?
A: Locate your local HHW (Household Hazardous Waste) collection site or speak with local auto parts store for more details.

Q: What does the Premium Seal mean?
A: Chevron Lubricants uses the Premium Seal on products to guarantee that we have selected the highest quality base oils and combined them with specific additives to help provide you with exceptional performance—which meets or exceeds industry and/or OEM specifications. The Premium Seal mark is a sign of quality that you can trust.

Q: How do I tell the difference between premium versus standard lubricants?
A: Look for the Premium Seal logo on the label or product information. It is the guarantee.

Q: What impact will products identified with the Premium Seal have on performance?
A: Products identified with the Premium Seal can provide excellent oxidation performance and long life. They will carry the highest endorsements from OEMs and typically meet all relevant performance specifications. In some cases, they will deliver better water handling capabilities with lower deposit formation, like lacquers and sludge, to help ensure longer oil and equipment life. Products identified with the Premium Seal require changing less often than lower-performance products and you can rely on their continued high performance for a longer time.

Q: How do I order Chevron lubricants?
A: Contact your local sales office. To find a marketer, click here:

Compressor Oils

Q: What is the difference between Cetus® PAO and Cetus HiPerSYN®?
A: Cetus PAO is formulated with a PAO or Group IV base oil, while HiPerSYN is formulated with Group III base oil.

Q: Is it acceptable to Regal® R&O in a reciprocating compressor that is in contact with highly corrosive gas content?
A: It depends on the type and percentage of gas that comes in contact with the lubricant.

Q: Can I switch from a diester compressor oil to a petroleum compressor oil?
A: The switch can be made only if the seals are changed. Diester-based oils swell seals, whereas, petroleum oils do not. So, if the seals are not changed when the oils are changed, the equipment would leak after the change-out.

Q: My compressor recommends a PAG (Polyalkalineglycol) ISO 46. Is it acceptable to use Cetus HiPerSYN 46?
A: No, PAG oils are highly incompatible with any other lubricant. We suggest using the recommended product following the OEM recommendations.

Q: My shop compressor recommends a non-detergent 30 weight. What Chevron compressor oil is recommended?
A: We recommend following the procedure to drain, flush, and then, refill with Rando® HD 100.

Gear Oils

Q: The oil in my conveyer gearbox is foaming. What could be causing this issue?
A: Typically, foaming occurs because the anti-foam depressant additive has depleted. When is the last time your oil has been changed? Foaming can also be the result of water contamination, or overfilling the gear box, to name a few root causes.

Hydraulic Oils

Q: All hydraulic oils are the same aren’t they?
A: While hydraulic oil standards are commonly agreed to and well established, the relative performance of hydraulic oil varies. This is due to variations in approaches and experience in formulating products, variations in the base oils used (hydraulic oils are in excess of 98 percent base oil) and different target applications and performance.

Additionally, there are hydraulic oils that emulsify water, and those that demulsify water. Demulsifying and emulsifying hydraulic oils are typically not compatible due to the nature of their chemistries. For the purpose of this FAQ, we are addressing demulsifying hydraulic oils.

Q: What are the key differences in hydraulic oils?
A: Variations in the base oil and performance additives used are the primary differences in hydraulic oils. To manage costs, some lubricants manufacturers use a variety of base oils and additives. This can lead to performance differences in these areas:

  • Oxidation
  • Water handling ability
  • Sludge formation
  • Filter life
  • Productivity
  • Fuel efficiency
  • Anti-wear / extreme pressure (EP)
  • Cold temperature pumpability

Consistent performance standards are important to help ensure risk-free equipment operation, and higher quality hydraulic oils meet or exceed these standards.

The use of different types of performance additives in the formulation can make a big difference. The approaches can vary, including the use of more or less zinc (an element in a key anti-wear additive), or the use of no zinc at all, such as in ashless hydraulic oils

Q: Why should I care about higher quality hydraulic oils?
A: In all industries, our close relationship with the original equipment manufacturers (OEMs) that use hydraulic equipment has indicated that hydraulic design pressures are increasing. In general, customers are expecting longer life from both the equipment and the hydraulic oil.

Oils that may have performed well in the past are being pushed to their limits.

Good lubrication is essential to the life and durability of your equipment and while it is generally less than 3 percent of the cost of owning equipment, it can have a much bigger impact on the cost of owning and operating equipment.

It is very true that saving a few cents today on a cheaper hydraulic oil will cost you many dollars in the longer term.

Q: What do the original equipment manufacturers (OEMs) say about higher quality hydraulic oils?
A: OEMs are very specific about the quality of lubricant used in their equipment and for very good reason. If the lubricant fails, so does their equipment. It is important to follow OEM guidance for warranty and for the extended life of your equipment.

Off-highway emission standards are becoming stricter—leading to a need to improve fuel efficiency. In mobile equipment such as excavators, fuel economy is linked to engine performance and hydraulic system efficiencies. By improving hydraulic system efficiencies, equipment can use less fuel per hour and increase production per hour—leading to improved utilization.

Hydraulic system pressures are also increasing, thus resulting in higher operating temperatures, which causes increased demands on the hydraulic fluids. In combination with these systems-related demands, equipment builders are moving to extended service intervals for fluids.

Due to higher hydraulic system pressures and the need for extended service life, OEM recommendations are moving to higher performance products.

Q: What is the difference between, Hydraulic Oil AW, Rando® HD, and Rando HDZ?
A: Hydraulic oil AW is made from Group I oil (currently Hydraulic Oil AW in North America is mostly made with Group II base stocks), Rando HD is a straight grade and Rando HDZ is a high viscosity index (‘multi-grade’) lubricant made from Group II base oils.

Rando HDZ 32, 46 and 68 viscosity grade oils are approved by major pump manufacturers. The high viscosity index can provide minimal viscosity change over a wide range of operating temperatures.

Fast water separation and excellent filterability ensure the product performs well in systems with close tolerances.

Rando HDZ hydraulic oil also provides excellent oxidation stability at high operating temperatures, potentially allowing for extended service life and cleaner performance.

Q: What does industry standard, three times the life and six times the life mean?
A: One way of comparing the oxidation performance of different oils is through a laboratory test called the TOST test where the results are given in hours. This test has a relationship to the performance capability in field applications. Actual life of the oil in an actual hydraulic system will depend on the operating environment.

The products that have historically been called hydraulic oils would generally meet a TOST life of around 1,500 hours or less. We call this the ‘industry standard.’

Rando® HDZ provides a TOST life of more than 5,000 hours, thus three times the ‘industry standard.’ Clarity® Synthetic Hydraulic Oil AW provides a TOST life in excess of 10,000 hours, thus, six times the life of an industry standard product. TOST testing, while not the only measure of hydraulic oil performance, does show a good correlation to relative oil life in field use.

Q: How do I change over from my current hydraulic oil to one of the newer ones?
A: If you are currently using Rando HDZ, you do not have to flush before using the new and improved Rando HDZ. If you are currently using an emulsifying hydraulic oil, you will have to drain, change filters, flush and fill with our demulsifying hydraulic oils due to incompatibility.

If you are not aware of the properties of the in-use hydraulic oil, then drain, change filters, flush and fill with our hydraulic oil.

If you intend to use a Clarity® (ashless/zinc-free) hydraulic oil where previously an oil containing zinc had been used, then a drain, filter change, flush and refill is required. Zinc and non-zinc formulations are often not compatible.

Generally, there is no need to drain and refill products when products are fully compatible, however, to maximize performance, tanks must be drained, filters changed and tanks refilled with the new, clean product to receive the full benefit of the new, clean product.

We always recommend following OEM recommendations and keeping the filtration, hoses, breathers and seals in good condition to ensure optimum performance.

Q: My hydraulic oil is dark and very thick after only 5 years, is it still good?
A: Oils do oxidize over time, in hydraulic and circulating systems; a sample of the oil should be taken every 6 months or annually to determine condition.

Q: Is there an antifoam agent in your hydraulic oils?
A: Yes, all our hydraulic oils would have an antifoam additive.

Q: Can I extend my drain intervals using the new Rando® HDZ?
A: Rando HDZ provides improved shear stability performance, with the use of a new viscosity index improver. Since the correct viscosity is maintained over a wider temperature range, pump efficiencies result. These efficiencies often can manifest themselves in lower pump temperatures and potentially extending the life of the pump and oil.

There are a number of factors that impact drain interval decisions. Some of these are operating conditions, system cleanliness, OEM drain recommendations, etc.

In general, Rando HDZ, along with a used oil analysis program like LubeWatch® can provide the best product / program combination to help a customer determine how far they can actually extend their drain intervals safely.

Q: What does FZG mean in relation to hydraulic oils?
A: FZG is a test normally reserved for gear oils to measure gear performance. It is a test reflective of combined EP/ AW performance in gear sets. Some companies include the FZG result in published data. Some hydraulic oil products with gear performance can indeed be used in lightly loaded gearboxes, but often their use is limited to smaller high-speed gearboxes because of the lower viscosities used in hydraulic oils. FZG results are given on a scale of 1-12 with 12 being the highest performance. For example, Clarity® Hydraulic Oil AW 32, 46, 68 has an FZG rating of ≥ 12, whereas, Rando HDZ 32 has a rating of ≥ 11, and Rando HDZ 46, 68, 100 have a rating of ≥ 12.

Q: What does the term “ashless” mean when referring to hydraulic oils and how do ashless hydraulic oils differ from standard hydraulic oils?
A: For many years Zinc Dithiophosphate (ZDDP), a metallic additive has been used in hydraulic oils as an approach to provide good anti-wear performance. The anti-wear performance of the ZDDP has been shown to give good protection in vane type pumps where vane tip wear was problematic. The use of ZDDP, however, does have its challenges, most notably with both the performance in the presence of water and contributing to degradation of metals, most notably that in piston pumps.

There are a number of factors that impact drain interval decisions. Some of these are operating conditions, system cleanliness, OEM drain recommendations, etc.

Q: I have a reciprocating compressor that is in contact with highly corrosive gas content and using I am using Regal® R&O product is that ok?
A: It depends on type & percentage of gas coming into contact with the lubricant. Do you have this information?

Q: Can I switch from a diester compressor oil to a petroleum compressor oil?
A: The switch can be made only if the seals are changed. Diester-based oils swell seals, whereas, petroleum oils do not. So, if the seals are not changed when the oils are changed, the equipment would leak after the change-out.

Modern formulations have improved in this area and continue to meet industry requirements. Specially designed premium hydraulic oils that do not contain Zinc have demonstrable advantages in these areas. Chevron ashless hydraulic oils, such as Clarity hydraulic oil AW and Clarity Synthetic hydraulic oil AW can be used in both vane and piston pumps.

Q: Are there any other advantages to ashless formulations?
A: Properly formulated ashless formulations have a high FZG rating making them suitable for light gear service.

Also, the technology employs base oils with a higher viscosity index. This improves low-temperature start performance and better film thickness at elevated temperatures. This can provide an opportunity to rationalize the number of products in use at a certain location while improving pump efficiency.

Q: Does Chevron make a fire-resistant hydraulic oil?
A: No, we do not make a fire-resistant product.

Q: Can I mix Clarity hydraulic oil with AW hydraulic oil?
A: No, Clarity hydraulic oils utilize acidic additives, many other AW hydraulic oils utilize alkaline additives, so they are not compatible.

Q: What viscosity grade is 1000 THF?
A: 1000 THF is a multi-grade 10W30 viscosity oil.

Q: Can I top off with hydraulic AW in place of 1000 THF in my hydraulic system?
A: AW Hydraulic Oils are designed for system with pressures over 1,000 PSI.

Q: Why would I use Hydraulic AW vs. GST in my hydraulic system?
A: AW Hydraulic Oils are designed for system with pressures over 1,000 PSI.

Q: Can I top off my hydraulic system with GST 32?
A: If you have a hydraulic oil in the system, do not add GST since it is not compatible with common AW hydraulic oils.

Q: I am looking for a non-conductive hydraulic oil for my bucket truck that works on power lines. Does Chevron make such a product?
A: Rando® HDZ 32 or 46 has a dielectric strength of 35 KV. Drain, flush, and refill. We do not make an EDM fluid which is a true 100% non-conductive oil.

Q: Can I use hydraulic AW 32 in my CAT equipment?
A: No, Caterpillar requires a product that contains 900 ppm zinc. We recommend Delo® TorqForce SAE 10W.

Q: My old tractor requires a 303 fluid for the hydraulics? What does Chevron recommend?
A: 303 is an obsolete John Deere recommendation, 1000 THF is a good option.

Q: Do you have a product for Ford’s ESN M2C134?
A: Chevron 1000 THF is recommended for this specification.

Q: Do you have a product to replace Kubota UDT fluid?
A: 1000 THF.

Q: Do you have a product that meets Volvo WB102 specification?
A: No, we do not make a product that meets this requirement.

Industrial Greases

Q: Does Chevron have a cross reference to Mobilgrease 28?
A: Chevron does not have any low-temp/low viscosity (below ISO 100) in our grease product line.

Q: Are all greases compatible with each other?
A: No, they are not. We recommend purging each time you change out any grease.

Q: What is the difference between an NLGI 00 and an NLGI 2?
A: NLGI 00 are semi-fluid, pourable products. NLGI 2 greases are not pourable & much more consistent.

Specialty Oils

Q: What Chevron product can I use to lubricate air tools?
A: GST® 32 or Aries® 32 or Regal R&O

Q: What product do you recommend for a heat transfer unit?
A: If the maximum bulk temperature does not exceed 550°F, then we recommend Heat Transfer Oil Grade 46.

Q: What is the difference between Chevron Way Lubricant and Way Lubricant Vistac?
A: Way Lubricant Vistac has an emulsifier which helps keep it on the slides and ways of machine tools. It also hold water in suspension. Way Lubricant separates from water and separates more quickly from water containing metal working fluids.

Q: What lubricant is recommended for a band saw?
A: Soluble Oil B.

Q: What lubricant is recommended for a saw that cuts rock or granite?
A: Brightcut NM


Q: Where can I buy ISOCLEAN® Certified Lubricants?
A: Click here to find an ISOCLEAN Certified Lubricant marketer in your area.