Best Emission Reducing Additives

1. EZ PASS™ Emissions Treatment | Catalytic Converter & O2 Sensor Cleaner | Emissions System Support | Smog Test Prep | 16 Fl oz, 2-Pack

The EZ PASS™ Emissions Treatment is a simple solution for your vehicle’s emission system. Just pour one bottle into a full tank of gas. It works while you drive to clean important parts like the catalytic converter and oxygen sensors.

This product supports smog and emissions efficiency. It helps reduce carbon buildup that can lead to higher exhaust emissions.

Using this treatment is easy and effective. Each 16 fl. oz. bottle treats up to 16 gallons of gasoline. For best results, use it every 2,000 miles to keep your engine running smoothly.

2. Muekday 2026 Upgraded Boost Up Vehicle Engine Catalytic Converter Cleaner Deep Cleaning Carbon Kit,Deep Cleaning(US Shiping) (4PACK)

The Muekday 2026 Upgraded Boost Up Vehicle Engine Catalytic Converter Cleaner is an easy-to-use solution for your vehicle. Just pour it into your fuel tank during refueling, and you’re all set for a cleaner engine.

This cleaner effectively reduces carbon build-up in key engine parts, such as the catalytic converter and fuel injectors. It helps improve your vehicle’s fuel efficiency and overall performance, making drives smoother and more efficient.

Enjoy better emissions control and improved miles per gallon. It’s safe for all gasoline and hybrid vehicles. Experience a cleaner engine today!

3. Bardahl DEF-Shot 3350 – The Ultimate DEF Cleaner and Anti-Crystallization Diesel Additive Reducing DEF Consumption – 5oz

Bardahl DEF-Shot 3350 is your ultimate DEF cleaner and anti-crystallization diesel additive. It’s designed to reduce DEF consumption and keep your exhaust system spotless.

This powerful formula eliminates DEF deposits for improved injector performance. Enjoy enhanced engine power and easy maintenance.

4. Motul Engine Clean | Oil Additive & Flush for Gasoline & Diesel Engines | Helps Remove Sludge & Improve Oil Flow | Supports Emission System Care & Engine Protection | 300ml

Motul Engine Clean is your simple solution for a cleaner, healthier engine. Just add it before your oil change, let your engine run, and it removes tough gunk. It works for all types of engines, making maintenance a breeze.

This powerful formula fights engine sludge for better performance. It helps your engine run smoother and can even improve fuel economy. Get ready for peak efficiency with every drive.

Lower your emissions and pass inspections with ease. Protect your engine for the long haul.

5. ATS Chemical 505 CRO Oil System Treatment – 12 oz Engine Oil Additive – Cleans Sludge, Reduces Emissions, Quiet Smooth Idle & Restores Performance in High-Mileage Gas & Diesel Engines

ATS Chemical 505 CRO Oil System Treatment is a powerful 12 oz engine oil additive. It cleans sludge and restores performance in high-mileage engines. Works for both gas and diesel engines.

This treatment reduces emissions and ensures a quiet, smooth idle. It fixes sticking parts like piston rings and lifters. Your engine will run smoother and more efficiently.

It also clears restricted lubricating screens and improves oil flow. This extends engine life and saves you money. A must-have for high-mileage vehicles.

6. Bardahl DEF-Shot 3353 – The Ultimate DEF Cleaner and Anti-Crystallization Diesel Additive Reducing DEF Consumption – 32oz

Introducing Bardahl DEF-Shot 3353, your ultimate DEF cleaner and anti-crystallization diesel additive. This powerful formula is designed to reduce DEF consumption and keep your diesel engine running smoothly.

It cleans DEF deposits effectively. It also improves injector performance. Plus, it enhances engine power.

Easy to use, this everyday diesel treatment prevents costly repairs by keeping your DEF system clean. Give your engine the performance-boosting daily care it deserves!

7. BIOBOR MD Diesel Fuel Additive for Marine & Road: Soot & Emissions Reducing Fuel Treatment, Anti-Gel Fuel Stabilizer, Prevents Corrosion & Ice | 16 Ounce, (BBMD16EZ01US)

Unlock your engine’s full potential with BIOBOR MD Diesel Fuel Additive! This powerful treatment slashes soot emissions by up to 94% and stops carbon buildup, keeping your engine parts clean and running smoothly.

Experience a boost in performance as BIOBOR MD enhances your fuel’s ignition, leading to increased torque and better fuel economy. It also adds lubricity, reducing wear and tear and saving you money on maintenance.

It fights ice for smooth operation. It disperses sludge for a cleaner system. It optimizes horsepower for peak performance.

8. Portable Engine Cleaner 120ml, Carbon Removal Additive, Boost Car, Truck, SUV & RV Performance, Catalytic Converter Cleaner, Reduces Emissions, Restores Engine Power

The Portable Engine Cleaner is a powerful carbon removal additive designed to boost the performance of your car, truck, SUV, or RV. It works by cleaning out carbon and oil sludge, helping your engine run smoother. This cleaner also reduces harmful emissions for a more eco-friendly drive.

Using this product is safe and simple. Just pour it directly into your gas tank, and you’re good to go! There’s no need to disassemble anything, which saves you time and money on repairs.

Keep your engine running strong with this preventive solution. It helps avoid costly repairs by preventing clogs and extending the life of your vehicle’s components.

9. Bardahl 3350 DEF-Shot – The Ultimate DEF Cleaner and Anti-Crystallization Diesel Additive Reducing DEF Consumption – 5oz (8-Pack)

Bardahl 3350 DEF-Shot is a powerful cleaner for your diesel exhaust fluid (DEF) system. It removes deposits left by DEF, keeping your exhaust system clean. This boosts engine performance and saves you money on repairs.

It restores DEF spray patterns, cuts down consumption, and protects vital parts like the tank, pump, and injector. By reducing backpressure, it increases engine power and improves fuel economy. This all-in-one treatment cleans both the emissions system and the fuel system.

Using it is simple: add one bottle to a DEF cube or jug before filling up. One bottle treats 2.5 gallons of DEF. Always dispose of the solution following local regulations.