Mcgraw 20 gallon air compressor review

Mcgraw 20 gallon air compressor review

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This particular model is from the Harbor Freight Mcgraw, which is an oil-lubricated 20-gallon air compressor. It’s a mid-budget air compressor ideal for those who want to upgrade their old oil-free 6-gallon, 10-gallon, or 20-gallon air compressors.  

Or, if you’re going to choose a new compressor for your home garage, where the air tools require moderate airflow, for example, 3 SCFM at 90 psi, 4 or 5 SCFM at 90 PSI (SCFM stands for standard cubic feet per minute), definitely this Mcgraw 20-gallon air compressor would be the best budget bit. Oil-free air compressors are ideal for small jobs, but they last a few years when they pass through heavy uses. Then, they stop pushing air effectively. As a result, most users complain that their air compressor keeps running continuously but cannot build pressure at a certain level. None of these issues you wouldn’t face in an oil-lubricated air compressor. 

What’s included with the Mcgraw 20-gallon air compressor? 

This 20-gallon Mcgraw comes with every essential kit that needs to go ahead; this particular model is an entirely factory-made unit; you need to attach the wheels and air intake filter and fill oil in it before running, and yes, all is done. The setup process is straightforward and will take 5 to 10 minutes to Complete the basic attachment.

Included kits:

  • The main unit: 20-gallon compressor
  • two larger wheels with nuts and bolts
  • Air intake filter
  • 1-bottle of compressor oil

In-depth review of the Mcgraw 20-gallon air compressor

Mcgraw 20 gallon air compressor


How will be Mcgraw 20-gallon air compressor performs on your tools? It depends on the air requirements of the tools you are using. Before you buy an air compressor, please consider the airflow capacity that fits your needs. 

Terms of this Mcgraw 20-gallon is an oil-lubricated air compressor that can deliver up to 4-SCFM (standard cubic feet per minute) at 90 PSI. And the maximum tank pressure is 135 PSI.

In our testing, the compressor took around 4 minutes and 48 seconds to fill the 20-gallon tank from ZERO to a maximum of 135PSI. 

Pressure recovery: 

The recovery time means the time gap between the compressor cut-in and cut-off positions. This 20-gallon compressor kick starts (cut-in) when the tank pressure level touches 100 PSI, and it Kicks out (cut-off) when the tank pressure reaches a maximum of 135 PSI. We measured it took around 49 seconds to reach the pressure level from 100 to 135 PSI, which is pretty fast for a 20-gallon home garage compressor. This 135PSI max tank pressure and quick recovery time are pretty enough to hold up most moderate jobs in the home garage.

What kind of work can you do with this Mcgraw 20-gallon air compressor? 

A 20-gallon air compressor is ideal for a home garage, where you need airflow to run most moderate air like nail guns, small air-demanding paint sprayers, blow guns, small-sized impact wrenches, or other applications. 

Considering the airflow capacity of this Mcgraw 20-gallon air compressor, it can hold up your regular demanding air tools. 

Can this Mcgraw 20-gallon compressor run an impact wrench?

The biggest answer we were looking for was whether this compressor could hold up impact wrenches. At first, we hooked up with a 1/2 inch Ingersol rand impact wrench that’s air requirement was 6 to 12 cubic feet per minute. We triggered the impact wrench at full throttle when the compressor tank pressure reached 135 PSI. As you know, these kinds of air tools require more air. Within 14 seconds, the tank pressure came down to under 100 PSI. But the tank size allows you to run a 3/8 impact for a few moments. There are so many people mentioned on the harbor freight website that they use this 20-gallon compressor to remove lug nuts, and no issues they’ve faced. 

Testimonials: Hear What the long time users Have to Say about the 20-gallon Mcgraw air compressor

Perfect For my garage

In the context of an average garage, this air compressor’s 20-gallon larger tank, 4 SCFM airflow at 90 PSI, and 135 PSI maximum tank pressure prove to be more than sufficient. Its performance meets my needs when it comes to tasks such as filling tires, utilizing my air impact wrench and operating various other tools. Since I don’t rely on it on a daily basis, there are times when I go several weeks without utilizing it. Given this intermittent usage pattern, there is no requirement for a high-end air compressor. I am genuinely satisfied with its capabilities and overall performance, finding it to be a reliable and practical choice for my garage.

It can run my 1/2”  impact wrench

The product in question offers exceptional value for its price. It effectively powers all of my garage air tools, including the 1/2″ Earthquake impact, without any issues. However, it is worth noting that it takes considerable time to fill up the tank from empty and when the tank pressure drops below 100 psi. Despite this, I have never entirely run out of air during usage. To ensure optimal performance and longevity, it is essential to clean the filter regularly. By maintaining this simple maintenance routine, the product can serve you reliably for an extended period.

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Hi, Eddie T. Jones and I am the author of I have been working with household appliances, tools, outdoor gear, and gardening tools for several years. I publish unbiased comparisons based on user reviews, expert reviews, and test results. I hope you like the website.

Best regards, Eddie T. Jones

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