Once you start using fuel additives,
You may have questions like:
"Should I add it every time I refuel?"
"How many kilometers should I drive before using it again?"
"Is it okay to add it when there's not much gasoline in the tank?"
"Will it be more effective if I add more than the specified amount?"
In conclusion, whether you need to add fuel additive every time depends on the product's purpose.
This is because the appropriate frequency of use differs between cleaning-type additives, which aim to remove dirt from the fuel system, and types that continuously address the state of the fuel itself or combustion.
What's important is not to think uniformly:
"I should add fuel additive every time just because it's a fuel additive."
Or,
"I should only add it once every few thousand kilometers."
This time, we will provide a clear explanation of fuel additive usage frequency, timing, continuous use, and precautions if too much is added.
Should I add fuel additive every time?
First, the conclusion.
Not all fuel additives need to be added every time you refuel.
This is because there are various types of fuel additives.
For example:
Cleaning types that remove dirt from the fuel system and combustion chamber.
Those aimed at preventing fuel oxidation and corrosion.
Those focused on combustion conditions.
Those that continuously condition the fuel system.
Each has a different purpose.
Therefore, the frequency of use also differs for each product.
In fact, KURE's "Perfect Clean DX" recommends use every 5,000 km or 6 months, while their fuel treatment recommends continuous injection to maintain effectiveness. This means that even for fuel additives from the same manufacturer, the method of use differs depending on the purpose.
Fuel additive usage frequency changes with "purpose"
Broadly speaking, it's easier to understand the usage frequency of fuel additives by categorizing them as follows:
Types for cleaning purposes
These products are designed to address deposits and dirt accumulated in injectors, intake valves, combustion chambers, and so on.
For this type,
Usage at regular mileage intervals.
Usage at regular time intervals.
Continuous use for the first application only.
Such usage patterns may be specified.
For example, WAKO'S Fuel One is recommended at a rate of one bottle per 20-60L of fuel, and continuous use is advised for older vehicles or those using it for the first time for better effectiveness.
In other words,
It doesn't necessarily mean "I want to clean it, so I'll keep adding it every time."
Types for continuous conditioning purposes
On the other hand, there are products that are added at a certain concentration every time fuel is used, aiming for a continuous effect on the fuel and combustion state.
For this type, a usage method where the appropriate amount is added each time according to the amount of fuel refueled can be considered.
What is important is not
"whether to put it in every time,"
but rather
"what kind of usage method the product is designed for."
Are PEA-based fuel additives needed every time?
When researching fuel additives, you often come across the term PEA.
PEA stands for polyetheramine and is used in fuel additives aimed at cleaning dirt accumulated in injectors, combustion chambers, and so on.
As explained in a previous article "What are Fuel Additives?", typical PEA-based products primarily focus on:
Addressing dirt.
Cleaning the fuel system and combustion chamber.
Restoring the original condition.
Rather than "changing combustion itself."
Therefore, it is important to follow the product-specific instructions for usage frequency.
For example, some of KURE's cleaning-type products recommend use every 5,000 km or 6 months.
It's not "needed every time just because it contains PEA."
Why are there products that require two consecutive uses initially?
Some fuel additive descriptions state,
"For the first time, use twice consecutively."
This usage method primarily considers the possibility of accumulated dirt in the fuel system and combustion chamber, especially in vehicles with high mileage or those used for a long time.
WAKO'S recommends two consecutive uses for older vehicles or those using it for the first time. KURE also suggests using it twice consecutively for some products in high-mileage vehicles or those used under severe conditions.
However,
The thinking is not "if twice is good, then ten times is even better."
Each additive has an appropriate concentration.
Adhering to the specified usage is fundamental.
What is the best timing to add fuel additive?
This also varies by product.
Generally,
Before refueling.
During refueling.
After refueling.
Many products are added to the fuel tank at one of these times.
Adding it before refueling, in particular, has the advantage of mixing easily with the fuel that then flows in.
On the other hand, some products recommend using them when the tank is full.
For example, KURE's Perfect Clean DX instructs users to use it when the fuel tank is full to maximize its cleaning effect.
In other words,
There is no absolute rule that "fuel additive must always be added before refueling."
Checking the product description is the most reliable method.
Is it okay to add it when there is little gasoline?
What's important is the "amount of fuel currently in the tank" and the additive's concentration, not the tank capacity.
For example, even if you have a 40L tank, if you only have 10L of fuel and add "40L worth" of additive, the additive concentration will be too high.
Fuel additive usage amounts are specified as:
1 bottle per 20-60L of fuel.
○ml for 50L of fuel.
○ml per 1L of fuel.
This is to maintain the appropriate concentration.
Therefore, when there is little fuel, it is important to consider
"the actual amount of fuel in the tank, or the amount to be refueled,"
rather than
"tank capacity."
Will adding too much fuel additive increase its effectiveness?
Generally, adding more than the specified amount is not recommended.
Fuel additives are not something where
"the more concentrated, the more effective."
Manufacturers set the usage amount to achieve an appropriate concentration for the assumed amount of fuel.
For example, WAKO'S Fuel One clearly states that if the fuel is less than 20L, the additive ratio should not exceed 1%. KURE also advises adhering to the specified amount for adding more than the recommended amount, as the formulation considers the balance between performance and safety.
Rather than adding more,
Using it at the correct concentration.
This is more important.
Why is adding too much not good?
Fuel additives themselves are composed of ingredients different from fuel.
If the concentration is unnecessarily high, it will deviate from the blending balance with fuel that the manufacturer has assumed.
Since the components also differ depending on the product, it is necessary to consider:
Combustion characteristics.
Fuel properties.
Compatibility with fuel system components such as seals.
Impact on the exhaust system.
Therefore,
Rather than thinking "a little extra might work better," it is fundamental to adhere to the specified amount for each product.
Is it okay to add two types of fuel additives simultaneously?
This also requires caution.
There are various components in fuel additives, such as:
Cleaners.
Water removers.
Additives for combustion promotion.
Additives related to octane rating.
Fuel stabilizers.
Even if each product is at an appropriate concentration when used alone, using multiple products simultaneously may result in combinations that the manufacturer did not intend.
In fact, KURE prohibits the combined use of some of its products with other fuel additives.
Therefore,
Avoid making the judgment, "A seems good," "B seems good," "Both together must be even better." Instead, it is important to check with the manufacturer regarding compatibility for combined use.
Is it okay to refuel immediately after adding fuel additive?
Basically, there's no problem as long as you follow the product's instructions for use.
In fact, some products are designed to mix more easily by utilizing the flow of fuel during refueling after adding the fuel additive to the tank.
On the other hand, some products recommend adding them when the tank is already full.
What is important is not just
"when to add the additive,"
but also
"whether the appropriate concentration for the specified amount of fuel is ultimately achieved."
What if the amount of fuel I add varies each time?
The amount of fuel added can vary each time, such as:
10L.
20L.
35L.
In such cases, products that specify the additive amount per liter become easier to calculate.
For example,
For a product that specifies 0.5ml per 1L of fuel:
If you add 10L, use 5ml.
If you add 20L, use 10ml.
If you add 30L, use 15ml.
If you add 50L, use 25ml.
This allows you to adjust the additive amount according to the amount of fuel you add.
The advantage is that it can always be used at a constant concentration.
What about Gelhorn 3+?
Gelhorn 3+, handled by Next Science, has a different purpose than typical PEA-based cleaning agents.
As explained in existing articles,
Typical PEA-based cleaning agents "address dirt."
Gelhorn 3+ "addresses combustion."
That is the difference.
Gelhorn 3+ can be used with:
Gasoline.
Diesel.
Kerosene.
The official usage amount is:
"0.5ml per 1L of fuel."
So, for a car refueling 40L, the guideline would be:
40L × 0.5ml = 20ml
The product page explains that it is designed to blend with the fuel without needing stirring.
Is it okay to add Gelhorn 3+ every time?
Gelhorn 3+ is a product focused on the condition of the fuel itself and combustion.
Therefore, its approach differs from cleaning-type fuel additives, whose primary purpose is a one-time cleaning and then cessation.
When using continuously,
It is important to use "fuel amount refueled × 0.5ml"
as a guideline, rather than fixing it to "how many ml every time."
For example,
10ml for 20L of fuel.
15ml for 30L of fuel.
20ml for 40L of fuel.
25ml for 50L of fuel.
Even when used every time,
The basic idea is to maintain the specified concentration,
rather than "adding more."
Will adding more Gelhorn 3+ increase its effectiveness?
Not recommended.
For Gelhorn 3+, the official page also recommends 0.5ml per 1L of fuel as a guideline for usage. In fact, even for user reviews that state they used more than the specified amount, the manufacturer recommends using it at a rate of 0.5ml per liter.
What is important is not
increasing the concentration,
but rather
using it with fuel at the intended concentration.
What should I do if I forget to add fuel additive?
If you forget to add a continuously used fuel additive once, it's best to avoid trying to compensate by adding double the amount next time.
For example,
Adding double the amount this time because you forgot last time.
Adding more next time because you only added half the amount.
These methods could temporarily increase the concentration.
Basically, use the specified amount for the amount of fuel currently in use at that moment.
Is it easier to manage if I add it every time I fill up?
For continuous-use types, this is a clear management method.
For those who always fill up their tank, they can check
how many liters were added this time
at the pump.
For example, if 42L were added,
42 × specified additive amount
can be calculated.
Using the amount of fuel added as a basis makes it easier to manage than trying to meticulously estimate how many liters remain in the tank.
However, the specific usage instructions for each product take precedence.
Is maintenance sufficient with just fuel additives?
Fuel additives are not a substitute for basic vehicle maintenance.
For example,
Engine oil change.
Spark plugs.
Air filter.
Fuel filter.
Injectors.
Various sensors.
If there are clear malfunctions in these, additives alone cannot solve the problem.
Especially if there are symptoms such as:
Engine warning light illuminated.
Unusual noises.
Strong vibrations.
Sudden decrease in fuel efficiency.
Inability to accelerate.
It is crucial to have the vehicle inspected and serviced first.
What's more important than "adding it every time"
The most important thing when using fuel additives is not
whether to add it every time.
What is important are these four points:
What is the purpose of its use?
Which fuels is it compatible with?
At what concentration should it be used?
How frequently is it designed to be used?
For example, with cleaning types, there is the idea of
intensive care at regular intervals.
On the other hand, with fuel conditioning types, there is the idea of
maintaining an appropriate concentration every time fuel is used.
Even though they are both called "fuel additives," their usage methods differ significantly.
Summary: For fuel additives, consider "purpose and appropriate concentration" rather than "every time"
Not all fuel additives should be added every time.
The frequency of use varies depending on the product's purpose.
For cleaning-type products, there are those that recommend use:
Every few thousand kilometers.
Every few months.
Continuous use only for the first application.
On the other hand, for products aimed at continuous conditioning of fuel and combustion, there is a method of adding the appropriate amount each time according to the amount of fuel refueled.
And what is equally important for both is
"adhering to the specified amount."
Fuel additives are not something where
more is better.
Appropriate concentration.
Appropriate timing.
Appropriate frequency of use.
By adhering to these, you can get closer to the way the product was originally intended to be used.
When choosing a fuel additive, it is important to confirm not only
"what it contains,"
but also
"for what purpose and how the product is to be used."