What Is The Best Additives for Water in Diesel [In 2025]

If you own a diesel vehicle, you know the importance of keeping your fuel system in top-notch condition. One of the most common issues diesel owners face is the presence of water in the fuel, which can lead to a myriad of problems, from engine performance issues to fuel system damage. To combat this, a range of diesel fuel additives have been developed to help remove and prevent water in the fuel. In this comprehensive review, we’ll take a closer look at some of the best additives for water in diesel, their features, and customer feedback to help you make an informed decision.

5 Best Additives for Water in Diesel Reviews

Heet Iso-HEET Water Remover And Premium Fuel Line Antifreeze + Injector Cleaner

Overview

The Heet Iso-HEET Water Remover And Premium Fuel Line Antifreeze + Injector Cleaner is a versatile product designed to address a range of fuel-related issues. It is formulated to absorb up to 5 times the water of regular gas dryers, preventing fuel system freezing and corrosion. Additionally, it includes an injector cleaner to keep your engine running smoothly.

Specs

• Absorbs up to 5 times the water of regular gas dryers
• Prevents rust and corrosion
• Includes an injector cleaner
• 12 fl. oz. bottle

Pros

• Effectively removes water from fuel lines
• Improves engine performance and fuel efficiency
• Affordable and easy to use

Cons

• No significant drawbacks reported by customers

Customer Review

Customers have been very pleased with the Heet Iso-HEET Water Remover. One reviewer noted a significant improvement in engine performance and fuel efficiency after using the product, while others praised its ability to prevent fuel line freezing and remove water from the system.

Hot Shot’s Secret Everyday Diesel Treatment

Overview

The Hot Shot’s Secret Everyday Diesel Treatment is a comprehensive diesel fuel additive that addresses a variety of issues. It is designed to improve fuel efficiency, reduce engine noise, and keep the fuel system clean by removing deposits and enhancing cetane levels.

Specs

• Boosts cetane levels by up to 7 points
• Cleans internal and external injector deposits
• Prevents rust and corrosion
• 1-gallon bottle

Pros

• Improves fuel efficiency and engine performance
• Keeps fuel system clean and well-lubricated
• Easy to use with every fill-up

Cons

• Some customers reported issues with leakage from the cap

Customer Review

Customers have praised the Hot Shot’s Secret Everyday Diesel Treatment for its ability to improve fuel efficiency, engine performance, and overall vehicle health. Many have reported a noticeable difference in their truck’s acceleration and smoothness after using the product.

STA-BIL Diesel All-Season

Overview

The STA-BIL Diesel All-Season is a comprehensive fuel additive designed to protect diesel engines in all seasons. It offers anti-gel protection, cetane boost, and fuel system cleaning and lubrication, making it a versatile choice for year-round use.

Specs

• Anti-gel protection down to -40°F
• Cetane boost for improved engine performance
• Cleans and lubricates the entire fuel system
• Demulsifies water for easy separation
• 20 fl. oz. bottle

Pros

• Effective in preventing fuel gelling in cold weather
• Improves fuel efficiency and engine performance
• Keeps fuel system components clean and well-lubricated

Cons

• No significant drawbacks reported by customers

Customer Review

Customers have found the STA-BIL Diesel All-Season to be a reliable and effective fuel additive. Many have reported improved fuel efficiency, smoother engine operation, and the successful prevention of fuel gelling in cold weather conditions.

Power Service 09280-06 Clear-Diesel Fuel & Tank Cleaner

Overview

The Power Service 09280-06 Clear-Diesel Fuel & Tank Cleaner is a comprehensive fuel system cleaning solution. It is designed to disperse contaminants, remove water, and stabilize fuel during long-term storage, making it a valuable tool for maintaining diesel engines.

Specs

• Disperses diesel fuel contaminants
• Removes water and slime from the fuel system
• Provides long-term fuel storage stability
• Safe for use in all diesel engines
• 80 oz. bottle

Pros

• Effectively cleans fuel tanks and systems
• Helps prevent fuel filter plugging and tank corrosion
• Good value for money

Cons

• No significant drawbacks reported by customers

Customer Review

Customers have found the Power Service 09280-06 Clear-Diesel Fuel & Tank Cleaner to be a reliable and effective solution for cleaning their diesel fuel systems. One customer noted that their tractor ran perfectly after using the product, while others praised its ability to keep water out of fuel lines.

TriboTEX Nano Oil Additive

Overview

The TriboTEX Nano Oil Additive is a unique engine treatment that utilizes nanotechnology to reverse wear and improve engine performance. Unlike traditional fuel additives, TriboTEX forms a diamond-like carbon coating on engine components, reducing friction and improving overall engine health.

Specs

• Nano-scale particles form a protective coating
• Reduces friction by 10 times compared to engine oil alone
• Reverses wear in engine bearings and components
• Compatible with all types of motor oil and engines
• Treats one regular truck, tractor, or small diesel engine

Pros

• Significantly improves engine performance and fuel efficiency
• Reduces engine noise and vibration
• Backed by extensive research and development

Cons

• Some customers report mixed results in terms of engine performance and oil consumption
• Considered expensive by some users

Customer Review

Customers have provided mixed feedback on the TriboTEX Nano Oil Additive. While many have reported impressive improvements in their vehicle’s performance, including increased fuel efficiency and reduced engine noise, others have not seen the same level of benefits. Some customers also expressed concerns about the product’s value for money.

Buying Guide: Choosing the Best Additive for Water in Diesel

Factors to Consider

• Water Removal Capabilities: Look for products that can effectively absorb and remove water from the fuel system, preventing issues like fuel line freezing and injector damage.
• Fuel System Cleaning: Choose additives that can clean and lubricate the entire fuel system, including injectors and other critical components.
• Cold Weather Performance: If you live in colder climates, consider products with anti-gel properties to ensure your diesel engine starts and runs smoothly in frigid temperatures.
• Ease of Use: Look for additives that are easy to use, with clear instructions and the ability to be added during regular fuel fill-ups.
• Value for Money: Evaluate the cost of the product relative to the benefits it provides, ensuring you’re getting a good return on your investment.

FAQs

How often should I use a diesel fuel additive?

Most manufacturers recommend using a diesel fuel additive with every fill-up, or at least every 5,000 miles, to maintain optimal engine performance and fuel system health.

Can I use multiple diesel fuel additives together?

It’s generally not recommended to use multiple diesel fuel additives together, as the combination of different formulas may not be compatible and could potentially cause more harm than good. It’s best to stick to a single, trusted brand of additive.

Will a diesel fuel additive damage my engine?

High-quality diesel fuel additives, when used as directed, are safe for all diesel engines and will not cause any damage. However, it’s important to follow the manufacturer’s instructions carefully to ensure the proper dosage and application.

How much additive do I need to treat my diesel tank?

The amount of additive required will depend on the size of your fuel tank. Most manufacturers provide guidelines on the appropriate dosage based on the tank capacity, typically ranging from a few ounces to several gallons of fuel.

Can I use a diesel fuel additive in a gasoline engine?

While some diesel fuel additives may be safe for use in gasoline engines, it’s generally recommended to use a product specifically formulated for the type of fuel your vehicle uses. Using the wrong additive could potentially cause more harm than good.

Conclusion

Keeping your diesel engine’s fuel system in top condition is crucial for optimal performance, fuel efficiency, and longevity. The products reviewed in this guide offer a range of solutions for addressing water in diesel fuel, from removing contaminants to preventing fuel gelling in cold weather. By carefully considering your specific needs and the features of each product, you can make an informed decision and ensure your diesel vehicle runs at its best. Remember to always follow the manufacturer’s instructions and maintain a regular maintenance routine to get the most out of your diesel engine.