Can You Use Non-Detergent Oil In A Lawn Mower? Check Before You Go

Good day!

Your lawn mower needs oil to run. However, you can’t add any oil and mix different types in your machine without knowing its effect. 

Can you use non-detergent oil in a lawn mower? Or can you mix synthetic and regular oil? The answers will affect the performance of your mower.

Let us help you by giving detailed explanations for those questions!

Can You Use Non-Detergent Oil In A Lawn Mower? 

The answer is Yes, but it’s not advisable. Non-detergent oil will accumulate sludge in the mower and degrade it over time. 

The ingredients in non-detergent oils explain their effect on the engine. You can only find anti-foaming in the oil. Additives needed to protect your lawn mower, like anti-rust, anti-oxidant, and anti-wear, are all absent. 

We use detergent oils in lawn mowers because they clean, protect, and prolong the engine’s lifespan. Without those components, non-detergent oils may cause damage to the mower after several uses. 

Often, we only use non-detergent oils for non-combustion engines or machines that don’t need particles floating in the oil.

Read more: Do Electric Mowers Need Oil?

Don’t confuse this with the non detergent oil, which is sometimes called nd30

Some of you may wonder why I have a quart of motor oil in my page. This is SAE 30 single grade oil, recommended for use in a lawnmower. 10W-30 is acceptable, but in the summer straight 30 is better as air cooled engines run hotter than liquid cooled engines. Don’t confuse this with the non detergent oil, which is sometimes called nd30. Non detergent oils should never be used in a gasoline engine as they can cause sludge buildup. I plan to change the oil in the lawnmower within the next week or two.

This is non-detergent oil. Obviously, it is not approved for use in automotive gasoline engines. The old labeling for it was ND-30. However, it has been determined that it will cause problems if used in a gasoline engine, mainly sludge buildup due to the lack of additives. It used to be recommended for lawnmowers. However, due to the anti-foaming agents, this is no longer necessary. I would not recommend this even for that as given the fact that the lawnmower uses the same fuel you would use in your car, it will leave carbon buildup behind. Steer clear of this no matter if it’s your car or your lawnmower.

Can You Mix Synthetic Oil With Regular Oil In A Lawn Mower? 

Yes. In your lawn mower, combining regular and synthetic oil poses no risk. However, regular oil may affect the expected effect of synthetic oil. 

Crude oil is the source of regular motor oil. It typically gives the best results in equipment with simple engine configurations.

On the other hand, chemical engineering makes the molecules in synthetic oil more consistent in shape and size. As a result, this oil often has fewer contaminants than regular oil.

Generally, additives added to synthetic oil during special production will improve its performance in high temperatures.

You’ll notice that each of these oils has different scientific principles. Mixing them won’t improve the efficiency of your lawn mower and the oil itself. 

Moreover, mixing the two types of oil is a waste of your money when you take into account that synthetic oils are more expensive. 

It’s OK if you need to fuel your machine, and the only practical and cost-effective choice is to combine synthetic and regular oil. However, do not make it your habit. 

Read more: Should I Change My Lawn Mower Oil After The Winter?

You can mix regular and synthetic oil but try to avoid it

Will Synthetic Oil Hurt A Lawn Mower? 

No. Synthetic oils are a good power source for your lawn mower. You do not need to replace it as frequently because it usually lasts longer than other types of oil. 

Besides, using synthetic oils in your lawn mower will come with many other benefits. For example: 

  • Under harsh circumstances, synthetic oils can withstand viscosity breakdown.
  • Due to their oxidation resistance, they can preserve their consistency for much longer.
  • There are no additives in the oils that might harm the environment or block the mower’s filter.
  • Synthetic oils are less likely to catch fire and ignite when subjected to an open fire or spark source because they have high flash points. 
  • Those oils don’t leave deposits in your engine since they don’t vaporize as rapidly as regular oils do.

The drawback of synthetic oil is that it is more expensive than regular petroleum-based solutions. The price difference can range from three times to 20 times, depending on the grade of the product. 

Paying more for synthetic oil could be worthwhile if you want an ecologically friendly solution or the protection offered by high-viscosity levels.

Synthetic oil is a good choice for your lawn mower

Can I Use 10w40 Oil In My Lawn Mower?

Yes, but you should only use 10w40 oil if you run out of regular oil. It’s not a good idea to use the oil in the long term. 

10w40 is a form of balanced oil that works for both automobiles and lawnmower engines. If your mower’s suggested oil is unavailable, you can try it as a temporary alternative.

Typically, a lawnmower runs on a type of engine with an air cooling system. This kind of motor differs from those used in cars with liquid cooling systems.

The oil’s viscosity may keep it from lubricating the engine. Your mower will suffer more damage as a result.

Then, the extreme heat in the air cooling system of your lawn mower will turn it into a ball of goo. Hence, manufacturers don’t recommend this solution. 

Can You Use Bar And Chain Oil In A Lawn Mower? 

Yes, but only if you have a 2-stroke lawn mower. If your machine contains four strokes, avoid using such oil. 

You can apply bar and chain oil to your two-stroke lawn mower because it’s mostly two-stroke oil. 

The oil reaches the combustion chamber to burn with the gasoline and then exits through the exhaust after cleaning the necessary components along the way. 

However, it won’t work that way in a four-stroke lawn mower. The problem is most modern lawn mowers have four-stroke engines. Hence, always check if you intend to use bar and chain oil in the machine.

Consider the type of the engine before the treatment

How Hot Does Lawn Mower Oil Get? 

A small machine like your lawn mower may reach a temperature of about 250°F. The temperature of the cylinder can approach 300 to 350°F, perhaps even hitting 400°F right next to the exhaust nozzle.

Lawn mowers emit noise and heat while working. The temperatures shown above are standard. Depending on some variables, the exact temperature of the mower may differ somewhat. These consist of the following:

  • The outdoor temperature when you read the result
  • The model and make of your lawn mower
  • The type and condition of the engine
  • How to run the mower 


You can use non-detergent oils in your lawn mower. Yet, avoid using it too often since it doesn’t include the necessary additives to clean the engine completely. 

So now you know more beneficial information about the type of oil you should and shouldn’t add to your lawn mower. If you have any questions, please comment below. We will get back to assist you. 

Thank you for reading!

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