303 Hydraulic Oil vs AW 32 (Which One’s Better)

Do you intend to purchase hydraulic oil for your hydraulic equipment or machinery? Perhaps for your construction vehicle or equipment.

When you can’t appear to find the proper one for you, it can be tremendously maddening. Now you might be confused between – 303 hydraulic oil vs aw 32? 

For ambient temperatures of +32°F to 104°F (0°C to 40°C), Your best suggestion is 303 Hydraulic. If the ambient temperature is outside this range, you can’t use 303 hydraulic oil. In colder weather applications, such as the pump of a snowplow, you can use AW 32 hydraulic oil.

But that’s not all of it. There’re a few more aspects to consider before deciding which one is more appropriate for you. 

Curious to know? Then keep reading!

Why Use Hydraulic Oil?

A hydraulic fluid’s primary role is to transmit energy throughout the system, allowing work and motion to be completed. Lubrication, heat transmission, and contaminant control are all handled by hydraulic fluids. 

Hydraulic oils are used in excavators and bulldozers, traction control, power steering systems, automated gearboxes, garbage trucks, elevators, and industrial machines or to fix your ripping chainsaw

Some good chainsaw chains are recommended below.

You can use these products without worries.

While making use of the hydraulic fluid, you should know about hydraulic equipment. Here are some most used hydraulic machinery available in the market:

A piece of quality machinery is a necessity. You can use it without any worries.

303 Hydraulic Oil vs AW 32: Brief Overview 

303 hydraulic oil vs aw 32

The gearbox, differential, and final drive gears in tractors and tools are lubricated with 303 Hydraulic Fluid. 

303 hydraulic is a multi-purpose fluid that can be utilized as a hydraulic medium, as well as for power steering, power brakes, power take-off, and implement drive.

AW 32 is most ordinarily used in hydraulics using vane, piston, or gear pumps, particularly when pressures surpass 1000 psi. 

They can also be used to lubricate reciprocating compressors that are minimally loaded, just like 50:1 vs 25:1 mixing.

Here’s a table of comparisons between 303 hydraulic oil and aw 32 to help you understand their differences quicker and better.

Comparison Factor303 Hydraulic OilAW 32
Viscosity Index6198
SAE Grade20 10w
Flash Point400 degree Fahrenheit420 degree Fahrenheit
Pour Point206.6 degree Fahrenheit-38 degrees Fahrenheit

Hydraulic oil that has a higher flash point is recommended below.

Now that I’ve given you an idea let’s dive into the details!

303 Hydraulic Oil vs AW 32: Detailed Comparison

Now it’s time for a detailed explanation of both the hydraulic fluid. Basically, it depends on your requirement for work. 

Why You Should Choose AW 32: Best Features

Controlling Oxidation: Sludge and varnish are reduced due to excellent oxidation and heat stability, protecting vital components while increasing oil and equipment life.

Protective Gear: The premium anti-wear technology provides protection that passes the pump tests of leading hydraulic equipment manufacturers, resulting in longer service life.

Filterability: Filter clogging and deposits are prevented by superior hydrolytic stability and rapid water separation.

Rust and Corrosion Protection: When moisture is present, the superior rust and corrosion prevention capabilities reduce maintenance.

Foam-Control: A specific anti-foam chemical encourages foam to break up quickly, lowering air entertainment.

High Viscosity Index: AW 32 Hydraulic Oil’s shear stability provides exceptional viscosity stability, allowing for consistent operation throughout a wide variety of temperatures and drain intervals.

Extremely Clean: For ultimate system protection, further filtering offers ultra-clean oils in certain viscosity ranges.

Reserve Quality: AW hydraulic oils can keep their high level of performance even under the most difficult working and draining situations.

Why You Should Choose 303 Hydraulic Oil: Best Features

  • In tractors and implements, lubricate the transmission, differential, and final drive gears.
  • Protects against excessive pressure and wear.
  • Anti-corrosion and rust protection
  • Protect the transmission, axles, and hydraulic pumps on the tractor.
  • Controlled frictional qualities allow wet brakes to hold effectively and power take-off (PTO) clutches to engage smoothly.

Final Verdict

Purified paraffinic base oils are used to make AW 32 hydraulic oil. It offers exceptional wear resistance, oxidation, and corrosion resistance, as well as foam and aeration control. 

For these reasons, I’d like to recommend you to use AW 32 Hydraulic fluids for your hydraulic equipment. 

Frequently Asked Questions

Question: Why is oil preferred to use instead of water in hydraulic systems?

Answer: The main reason we use oils instead of water in hydraulic systems is that water has a low boiling point, which means it might start boiling inside a hydraulic cylinder in high-temperature applications, causing corrosion.

Question: How hydraulic fluid and universal tractor fluids are different from each other?

Answer:  They’re made for use in a variety of tractor and heavy-duty machinery components. Tractor fluid lubricates the working elements within a gearbox, whereas hydraulic oil delivers power.

Question: Is there a difference between AW32 and ISO 32?

Answer: ISO 32 is merely a viscosity range for industrial oils, which are commonly used in hydraulics; it makes no mention of any additives that may be present. Anti-wear agents are necessary for AW 32, and they may also contain other chemicals that may be hazardous in some applications.

Question: What is AW 46 hydraulic oil and what does it do?

Answer: ValvolineTM AW 46 Synthetic Hydraulic Oil is a synthetic hydraulic oil by Valvoline. For use in a wide range of hydraulic systems, this top-tier oil is made with premium lubricant base oils and additives. It’s a non-detergent zinc-based oil with outstanding oxidation, as well as rust and foam inhibitors.


So here’s the entire discussion about  303 hydraulic oil vs aw 32  and it has finally come to an end. Despite their similarities, I’ve tried my best to bring out the differences between these hydraulic fluids.

Hopefully, I was able to assist you in determining which of these options is best for your hydraulic apparatus—wishing you the best of luck with your hydraulic equipment.

Take care until the next time.

Kevin Smith

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