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How Oily Coffee Beans Can Ruin Your Espresso Machine and Coffee Taste

            Coffee Beans in Superautomatic  Espresso Machines

An espresso is comprised of two simple ingredients: coffee beans and water. Ensuring you are using high quality beans and water are paramount to achieving a great tasting espresso. But did you know that the quality of the beans you use also plays a key role on how well your espresso machine works?

Read on to learn how using oily beans can not only impact coffee taste but can also impact how your espresso machine operates.

Coffee Roasts- What You Should Know

Let’s start by saying that there are no such thing as "espresso beans". They are only coffee beans. What distinguishes coffee beans is their roast. Roasted coffee can range from light to dark. 

Technically speaking,  any bean can be used to make an espresso –  espresso is a coffee brewing method. However, in order to achieve the rich, deep, bold, and smooth taste that defines an espresso, the beans used need to be roasted from medium to medium-dark range. It is this type of roast that will produce what we consider an espresso complete with a rich, velvety crema. 

The problem lies in that there are many coffee roasters that produce very dark roasts and label them as "espresso beans". The unknowing consumer will choose this product thinking it is suitable for their espresso machine. However, overlydark roasts will wreak havoc on espresso machines.

There are two main problems with really dark roasts:

  1. Dark roasts have significant surface oil; and
  2. Dark roast make your coffee taste burnt, smokey, and bitter.

Understanding the Coffee Roasting Process

All coffee beans start off green. As they roast, their colour will change depending on the length of time they roast and the temperature at which they roast. As coffee beans roast, they begin to release oils. The darker the roast, the more surface oil the bean will have. So those very dark roast will be extremely oily. In fact, they will look and feel greasy. 

This residual oil found on the surface of the beans will cling to your machine components and herein begins the problem. Those oils, over time, will compromise how your espresso machine works. Additionally, those very dark roasts will taste very burnt and bitter. Those who insist they don’t like espresso have often only tried espresso made with this kind of bean. Who likes a burnt and bitter aftertaste?

Oily Coffee Beans that have been overly roasted and have visible surface oil

How do oily beans affect espresso machines?

Overly roasted beans are oily and leave a greasy residue on all your machine components. Picture a frying pan that has residual oil on its' surface. You know how hard it is to clean, right? The same holds true for espresso machines. Overtime the residual oil from the oily coffee beans becomes gummy and sticky and will adhere to your machine's components. 

Here are some issues that will occur if you use over oily coffee beans in your espresso machine. You may notice:

  1. Sticky bean hoppers which will impede coffee beans from flowing smoothing into the grinder. 
  2. Machine grinders will become gummed up causing coffee grounds to stick together and become solid and clay like.
  3. Screens on brew units, portafilters, or even mocha pots will become clogged and the machine will struggle to produce a coffee or the coffee will flow out painstakingly slow.

Bean Hopper that has become sticky due to oily coffee beans

Here is a bean hopper on a superautomatic espresso machine that has an oily residue from the use of oily coffee beans.

If you use oily coffee beans on your espresso machine, it will not be a matter of if your machine needs servicing, but when. So if you have used oily beans, be sure to get your machine thoroughly cleaned by an authorized service centre and use the right beans moving forward.

How will oily beans affect the taste of your coffee?

In addition to the coffee tasting burnt because the beans are over roasted, the oils that build up on machine components will become rancid over time.

 Rancid oil is sure to produce make a foul tasting coffee. This will certainly leave an unpleasant aftertaste.

What to look for in coffee beans for an espresso machine

When choosing beans for your espresso machine or any coffee appliance consider the following:

  • The roast: you want medium to medium dark roasts. Don’t assume that beans labelled espresso are necessarily the correct roast. 
  • The look and feel of the beans: If you can visually see an abundance of oil on the surface of the beans and they feel oily, then they are not ideal for your espresso machine.
  • Coffee Blends: each bean varietal responds uniquely to the roasting process. Some varieties will naturally produce more oils. Buying coffee blends helps to balance the amount of oil in the beans. Some oil in coffee beans is important because it adds to the flavour and body of the coffee it will produce. The beautiful crema, a hallmark of a good espresso is also a result of emulsified oils. 

Popular coffee bean brands that are generally oily

In my 30+ years experience in the sales and service of super superautomatic espresso machines, there are a couple of brands that seem to be primary culprits when it comes to surface oil and the impact on the functionality of espresso machines.

Starbucks Brand and Kirkland Espresso Brand are brands two brands to avoid.

I won’t give my personal opinion on the taste of these beans because taste, after all, is a matter of personal preference...but I can report that clients who bring in their machine for servicing report they have used these two brands of coffee beans.  Usually, their machines need servicing for issues as described above.

Espresso Canada's Coffee Bean Collection

Here is a shameless plug for our coffee beans sold under our label. These beans are ideal for all coffee brewing methods (espresso, siphon, pour over, aeropress,  percolators),but they have been specifically blended for use in stove top, manual or superautomatic espresso machines It is these appliances that have been designed specifically for espresso brewing. 

Espresso Canada Miscela Bar Coffee Beans

In addition to working well in espresso machines, the coffee our blends produce is smooth, sweet, and velvety. It is worth giving it a try. These beans have been blended specifically to minimize issues related to coffee oils in espresso machines.

What to do if you have been using oily coffee beans

If you have been using overly oily coffee beans, use a vacuum to remove beans from the bean hopper. Depending on how long you have been using oily beans, you may need to engage the services of a certified service centre to give your machine a deep cleaning and overhaul.

It is important to determine if any components have been compromised and change those parts.

The most important thing is to stop using oily beans right away.

Why to avoid oily coffee beans in your espresso machine

In short, oily beans will affect the taste of your espresso and more importantly, overtime they will compromise how your machine operates. Continuing to use oily beans can result in costly repair bills and down time for your machine. The latter point is the most concerning because who even wants to consider a morning without your favourite brew.

Contact us if your machine needs servicing or if you want any other information about coffee beans or espresso machines. We are happy to help.

Comments (5 Responses)

23 March, 2021


Muchas gracias. ?Como puedo iniciar sesion?

14 December, 2020



14 December, 2020



14 December, 2020



14 December, 2020



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