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Good Quality Oil and Air Separator Filter (59039990 ...

The "Oil Separator Air Compressor 59039990" is a replacement air/oil separator filter element for industrial screw air compressors, often associated with brands like Hitachi or Liutech, designed to remove oil mist from compressed air, ensuring clean air with very low oil content (below 3ppm) and high filtration efficiency (around 99.9%), typically made from imported fiberglass and needing replacement every few thousand hours of operation.

Key Features & Specifications:

Good Quality Oil and Air Separator Filter (59039990) (59061610)
About this Item. ... Purchase Qty. ... Part Number 59039990 Product Name Air Oil Separator 59039990 Brand AIRPURE Filtering precis...
Made-in-China.com
Interchange High Quality Compressor Oil Gas Separator Filter ( ...
Interchange High Quality Compressor Oil Gas Separator Filter (59039990) - Hitachi Oil Separator, Hitachi Compressor Filter | Made-
Made-in-China.com
Replacement Liutech 150HP Air Compressor Air Oil Separator for ...
Product specification * Application:air compressor. * Type:compressor separator filter. * Brand Name:mengma. * Place of Origin:Chi...
Xinxiang Mengma Filter Co.,Ltd.

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1PCS NEW FOR Air compressor oil-gas separator 59039990

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For screw compressors requiring tailored solutions, the 59039990 oil separator offers complete customization without compromising quality.

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jiadeairpower.com

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jiadeairpower.com

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Air compressor filters air oil separator 59039990 air compressor spare parts. INGERSOLL RAND AIR OIL SEPARATOR 22388045. INGERSOLL RAND AIR OIL SEPARATOR ...Read more

Oil Separator Air Compressor 59039990 from www.jiadeairpower.com

Air Compressor Filters 9270021s Replace Oil and Air Separator ...

Made-in-China.com

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Air Compressor Filters 9270021s Replace Oil and Air Separator Filter (51803020) (59039990) ; Filtration efficiency. 99.9% ; Service life. 3500h-6000h ; Initial ...

High Quality Air Compressor Oil Separator Element 59039990

Alibaba.com

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Alibaba.com

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Replace high quality air compressor oil separator element 59039990 58453020. Enjoy durable, efficient, and reliable performance. Shop now for peace of mind!

Replacement Hitachi Oil Separator Filter 59039990

Xinxiang Mengma Filter Co.,Ltd.

https://www.mengmafilter.com › showroom › replaceme...

Xinxiang Mengma Filter Co.,Ltd.

https://www.mengmafilter.com › showroom › replaceme...

Replacement Hitachi Oil Separator Filter 59039990 · 1. Type: Compressor air filter · 2. Condition: New · 3. Medium material: Paper · 4. Part number: 52322330 · 5.Read more

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Coolworks Filter

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Hitachi Air Compressor Spare Parts - Dadi Filter Oil ...

Alibaba.com

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Filter Paper Material for Hitachi Air Compressors Spare Parts Oil Separator 36104040 36214040 58453020 59039990 59031840 · model number (2) · Ship to · Key ...Read more

Oil Separator Air Compressor 59039990 from www.alibaba.com

People also ask

How to tell if an oil separator is bad?

Bad Vent Oil Separator Symptoms - In The Garage with CarParts.com

A bad oil separator (or PCV valve) causes symptoms like thick white smoke from the exhaust, rough idling, misfires, increased oil consumption, and the Check Engine Light coming on, often with codes for lean conditions or fuel trims, because it fails to separate oil from crankcase vapors, leading to oil entering the intake and combustion. You might also see sludge under the oil cap, oil leaks from seals due to increased pressure, or hear a whistling/squealing noise, says CarParts.com.

Excessive Smoke: White smoke from the exhaust, especially on startup, as oil burns.
Rough Engine Performance: Misfires, hesitation, or poor idling due to incorrect air-fuel mixture.
Check Engine Light: Illuminates with codes like lean conditions, fuel trim faults, or misfires.
Increased Oil Consumption: Needing to top off oil more frequently without obvious leaks.
Oil Leaks: Increased crankcase pressure can push oil past gaskets and seals, causing leaks.
Sludge: A milky, thick substance under the oil cap indicates moisture/oil mixing issues.
Unusual Noises: Whistling or high-pitched squealing from the engine bay.
Oil in Intake: Inspection reveals oil in the intake tube or throttle body.

Volkswagen - Oil Separator - Failures, Symptoms, and Product Review ...

Aug 23, 2019 — um so this is very common and it's very easy to replace uh typically to replace. this. I'd give it probably about half...

YouTube ·

FCP Euro

Oil separator as preventative maintenance?

Mar 22, 2024

Reddit ·

r/GolfGTI

Bad Vent Oil Separator Symptoms - In The Garage with CarParts.com

Feb 2, 2024 — The oil separator removes the oil from the crate case vapors and feeds it back into the system by channeling the blow-b...

CarParts.com

Signs Your BMW's Oil Separator Is Failing - Auto Stop

Nov 26, 2022 — Sludge Under Your Oil Cap When the oil separator system fails, it may fail to remove all the moisture from the oil ret...

tomsautostop.com

How Do I Know If Your Air Oil Separator is Bad?

Anand Filters

Tips to Identify Air-Oil Separator Failure in Your Porsche

Feb 21, 2024 — 1. Excessive Smoke from the Exhaust. One of the most evident signs of a failing AOS is white smoke pouring out from th...

Franklin Performance

Identifying Air-Oil Separator Failure in Your Porsche

May 7, 2025 — Rough Idle or Poor Engine Performance: A faulty air-oil separator can introduce excess oil vapor into the engine, distu...

Bluewater Performance

Signs of Air-Oil Separator Failure in Your Porsche

Apr 19, 2020 — If the air-oil separator has begun to fail or failed already, you'll notice one or all of the signs below: * Squealin...

europeansautotech.com

Trouble Shooter | Vacuum Leaks | Oil Separator | MOTOR Magazine

A malfunctioning oil separator can cause a whistling noise. Other signs of a problem include: * The engine running rough * The Che...

motor.com

How often should an oil separator be replaced?

An oil separator's replacement frequency varies but typically falls between annually and every 4,000 to 8,000 operating hours, depending heavily on usage, contamination levels (like dust), and manufacturer recommendations; you should also replace it if performance drops or a differential pressure gauge indicates high restriction. For heavy-duty air compressors, 4,000 hours is a common benchmark, while cars and smaller systems might follow a yearly schedule or be driven by symptoms like excessive smoke or oil in the intake.

General Guidelines by Application

Air Compressors:
Often recommended every 4,000 hours or annually, especially for rotary screw types, to maintain low oil carryover.
Vehicle Engines (e.g., BMW, Porsche):
Varies greatly; follow the manufacturer's schedule or replace when symptoms like smoke, poor performance, or increased oil consumption appear.
Oil-Water Separators (Industrial/Commercial):
Regular cleaning (weekly/monthly) is key, with full inspections annually, but replacement might be needed sooner if damaged or clogged.

How often should I replace the oil separator box on a B21FT?

Jan 29, 2015 — Install Dust Filter: While using OWS for discharging bilge mixture containing dust and sand (a coarse-grained entity),

Facebook ·

TurboBricks

5 Preventative Maintenance Tips to Protect Your Air System - Fluid Flow

Fluid Flow Products, Inc.

When to Change the Air Oil Separators? - Air Compressor Filter

Jan 24, 2015 — 您现在的位置：主页 / News2 / news / When to Change the Air Oil Separators? The service life of the oil separator cartridge is ...

Shanghai Airmax co.,ltd

4 Signs You Need to Replace Your Oil Separator - Aline Pumps

Apr 5, 2023 — Leaking or Damage If you notice any leaks or damage to your oil separator, it may be time for a replacement. A damaged ...

Aline Pumps

Oil & Separator Change Guide for Atlas Copco GA VSD+ Compressors

Aug 21, 2025 — When to Change the Oil and Separator * Oil: Typically every 4,000 to 8,000 hours depending on your environment and us...

Air Compressor Services

Signs Your BMW's Oil Separator Is Failing | Auto Stop

Nov 26, 2022 — It's critical to pay attention to the signs of a faulty or failing oil separator system because a complete failure of ...

tomsautostop.com

The Ultimate Guide to Oil-Water Separator Cleaning and Maintenance

Great Lakes Power Vac

Tips to Identify Air-Oil Separator Failure in Your Porsche

Feb 21, 2024 — Signs of Air-Oil Separator Problems * Excessive Smoke from the Exhaust. ... * Oil in the Intake. ... * Decreased Engi...

franklin-performance.com

Air Oil Separators - Aaba Filters

An oil separator's service life is typically 4,000 to 6,000 operating hours. Air oil separators remove compressor lubricant from t...

Aaba Filters

Cleaning of oil separators | Delta - Petrol

It is required to keep separators clean, in accordance with environmental regulations, and cleaning is recommended not only annual...

Delta - Petrol

Why is my air compressor spitting out oil?

Your air compressor is leaking oil due to worn gaskets/seals, incorrect oil level (too much), restricted air intake causing pressure issues, or internal component failure like piston rings, often from age, wear, improper installation, or lack of maintenance, leading oil past seals and out vents or connections. Identifying the source (gaskets, seals, oil pan) helps, but internal wear often requires professional repair or replacement, says this source.

This video shows how to find and fix a leak on an air compressor:

Excess Oil: Overfilling the compressor with oil can cause it to push excess out.
Restricted Air Intake: A clogged or restrictive air filter can create backpressure, forcing oil past components, notes this article.
Worn Piston Rings/Crankshaft: Inverted or worn piston rings can allow oil into the cylinder and out the air outlet.
Improper Shutdown/Operation: Incorrectly closing valves or tilting the unit can cause "oil vomiting," according to this site.
Faulty Air-Oil Separator: The separator or its filter system might fail, allowing oil carryover.

Locate the Leak:
Run the compressor briefly (carefully!) and check for drips or feel for escaping air around gaskets, seals, and connections. Use UV dye for small leaks.
Check Oil Level & Filter:
Ensure you haven't overfilled it and that the air filter isn't clogged.
Inspect Gaskets/Seals:
Replace any brittle or cracked gaskets/seals, often found on the pump head or crankcase, says this YouTube video.
Address Internal Issues:
If oil is in the airstream, you likely have worn piston rings or a bad oil separator, which may need professional attention.

Compressor leaking oil out breather. Bad ring? : r/DIY

Feb 25, 2024

Reddit ·

r/DIY

How To Find And Repair A Leak On A Air Compressor | Quick Fix

Apr 14, 2017 — this is how I find the leak i'm going to turn the air compressor. on and then I'm going to run my. hand kind of around...

YouTube ·

Garen & Ellie

Why Is My Diesel Engine Air Brake Compressor Leaking?

Mar 31, 2021 — Oil Leaking Externally: External leaks on the air compressor are usually going to be coming from the oil pan, head gas...

Highway and Heavy Parts

'Oil Vomiting' Air Compressors

Aug 16, 2018 — I hope this article is of help to you if you experience this problem with your air compressor. I would say 50% of the ...

air-compressor-guide.com

Compressor spitting out oil.... | Sawmill Creek Woodworking Community

Apr 28, 2012 — I will try to post a pix when I get back to shop..... I think this thread confirms my suspicions.... with NO filter on...

Sawmill Creek Woodworking Community

4 Common Air Compressor Problems [With Solutions]

Nov 10, 2020 — Inverted piston rings. Upside-down piston rings indicate that the crankshaft is starting to go. They also contribute t...

TMI Compressed Air

Air Compressor Leaking Oil - BENEAIR

Jul 8, 2021 — Material: Material is one of the most significant factors that can be a source of a leak in the compressor. But most ma...

BENEAIR

Why do I have compressor oil in my airstream/oil carryover? | VMAC Air

Feb 26, 2025 — Other reasons include: * Incorrect shutdown procedure * Lack of service, coalescing filter compromised * Poor fit betw...

VMAC Knowledge Base

Finding and Fixing Leaks in Air Compressors

Replace Worn-Out Seals and Gaskets Replace any damaged or worn-out seals and gaskets with new ones. Ensure they are properly insta...

abacaircompressors.com

Common Causes of Oil Leaks | FRAM

Apr 19, 2024 — The most common culprits are worn-out gaskets and deteriorated seals around rotating parts like the crankshaft. Over t...

fram.com

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Factory Wholesale Price Industrial Compressor Parts Oil Air ...

Made-in-China.com

https://airpurefilter.en.made-in-china.com › product › C...

Made-in-China.com

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Part Number. 59039990 ; Product Name. Air Oil Separator 59039990 ; Brand. AIRPURE ; Filtering precision. 0.1μm ; Oil contained in compressor. below 3ppM.

Replacement Liutech 150HP Air Compressor Air Oil ...

Wuhan Amark Technology Co., Ltd

https://www.whamark.com › showroom › replacement-li...

Wuhan Amark Technology Co., Ltd

https://www.whamark.com › showroom › replacement-li...

Replacement Liutech 150HP Air Compressor Air Oil Separator for Part Number 34220 09600 59039990. Page Counting Numbering Paging Machine is used to ...Read more

Oil Separator Air Compressor 59039990 from www.whamark.com

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1PCS NEW FOR Air compressor oil-gas separator 59039990

‎Order Custom 59039990 Customizable High-quality Oil ...

Air compressor filters air oil separator 59039990 air ...

Air Compressor Filters 9270021s Replace Oil and Air Separator ...

High Quality Air Compressor Oil Separator Element 59039990

Replacement Hitachi Oil Separator Filter 59039990

ODM Oil Separator Air Compressor 59039990 Wholesaler ...

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Benefits of An Air Oil Separator In An Air Compressor - ELGi Blog

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