---
product_id: 203341010
title: "Diesel Fuel System Kit - AR6400-D (12 oz) + AR6500 (40 oz) - Complete Restoration For All Diesel Engines, Injector Cleaner, Lubricity Improver, DPF & Turbo Deposit Control, Cetane Booster"
brand: "archoil"
price: "€ 168.18"
currency: EUR
in_stock: true
reviews_count: 12
category: "Archoil"
url: https://www.desertcart.com.cy/products/203341010-diesel-fuel-system-kit-ar6400-d-12-oz-ar6500-40
store_origin: CY
region: Cyprus
---

# Treats up to 400 gallons fuel Boosts cetane by +8 points Two-step deep clean + maintenance Diesel Fuel System Kit - AR6400-D (12 oz) + AR6500 (40 oz) - Complete Restoration For All Diesel Engines, Injector Cleaner, Lubricity Improver, DPF & Turbo Deposit Control, Cetane Booster

**Brand:** archoil
**Price:** € 168.18
**Availability:** ✅ In Stock

## Summary

> ⚡ Unlock your diesel’s hidden power — cleaner, smoother, stronger!

## Quick Answers

- **What is this?** Diesel Fuel System Kit - AR6400-D (12 oz) + AR6500 (40 oz) - Complete Restoration For All Diesel Engines, Injector Cleaner, Lubricity Improver, DPF & Turbo Deposit Control, Cetane Booster by archoil
- **How much does it cost?** € 168.18 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/203341010-diesel-fuel-system-kit-ar6400-d-12-oz-ar6500-40)

## Best For

- archoil enthusiasts

## Why This Product

- Trusted archoil brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Massive Fuel Coverage:** One kit treats up to 400 gallons, ensuring long-lasting engine protection and efficiency.
- • **Powerful Cetane Boost:** Raises cetane by up to 8 points for faster ignition and smoother, more responsive drives.
- • **DPF & Turbo Deposit Control:** Keeps diesel particulate filters cleaner and turbochargers performing at their best, reducing costly regens.
- • **Complete Two-Step Fuel Reset:** Deep cleans injectors with AR6400-D, then maintains with AR6500 for peak diesel performance.
- • **Advanced Lubricity Protection:** Improves lubricity by 43%, safeguarding sensitive fuel system parts like CP4 pumps.

## Overview

The Archoil Diesel Fuel System Kit combines a potent 12 oz injector cleaner (AR6400-D) with a 40 oz diesel treatment (AR6500) to deeply clean, protect, and optimize all diesel engines. It removes deposits, boosts cetane by up to 8 points, improves lubricity by 43%, and supports DPF and turbo health for enhanced fuel economy, smoother acceleration, and reduced emissions. Trusted by thousands, this kit delivers long-lasting performance gains across all diesel vehicles and equipment.

## Description

Buy Archoil Diesel Fuel System Kit - AR6400-D (12 oz) + AR6500 (40 oz) - Complete Restoration For All Diesel Engines, Injector Cleaner, Lubricity Improver, DPF & Turbo Deposit Control, Cetane Booster: Diesel Additives - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Optimize Performance and Efficiency - Archoil Diesel Fuel System Kit, consisting of the AR6500 Diesel Treatment (40.6 oz) and the AR6400-D Diesel Fuel System Cleaner, proves to be an exceptional combination for optimizing the performance and efficiency of diesel engines. With their advanced formulas and proven effectiveness, this kit deserves a five-star rating. The AR6500 Diesel Treatment is a powerful additive designed to enhance the performance of diesel engines. It improves fuel economy, reduces engine wear, and minimizes emissions. This treatment is formulated with state-of-the-art nanoborate technology, which provides superior lubrication and protects fuel system components from wear and tear. The AR6500 Diesel Treatment also helps to prevent fuel oxidation, corrosion, and the formation of deposits, ensuring a clean and efficient fuel system. The AR6400-D Diesel Fuel System Cleaner complements the AR6500 Diesel Treatment by thoroughly cleaning the fuel system. It removes carbon deposits, varnish, and other contaminants that can accumulate over time and negatively impact engine performance. By using the AR6400-D Diesel Fuel System Cleaner, you can restore power, improve fuel efficiency, and reduce harmful emissions. This cleaner is compatible with all diesel engines, including high-pressure common rail (HPCR) systems. Both products in the Archoil Diesel Fuel System Kit are easy to use. The AR6500 Diesel Treatment can be added directly to the fuel tank during refueling, and the AR6400-D Diesel Fuel System Cleaner is added to the fuel system before an oil change. Following the provided instructions ensures proper application and maximum benefits. One of the standout features of this fuel system kit is its proven track record. Archoil is a trusted brand known for its high-quality products, and the Diesel Fuel System Kit is no exception. Many users have reported noticeable improvements in engine performance, fuel efficiency, and overall drivability after using this kit. It is particularly effective in resolving common issues such as rough idle, sluggish acceleration, and excessive smoke. Another notable advantage of the Archoil Diesel Fuel System Kit is its long-lasting effects. The AR6500 Diesel Treatment provides ongoing protection and lubrication, ensuring sustained performance benefits. The AR6400-D Diesel Fuel System Cleaner's effects can last for thousands of miles, making it a cost-effective solution for maintaining a clean and efficient fuel system. Furthermore, this kit is safe for use in all diesel engines and has no adverse effects on engine components or emissions systems. It is compatible with all diesel fuels, including ultra-low sulfur diesel (ULSD) and biodiesel blends. In summary, the Archoil Diesel Fuel System Kit, consisting of the AR6500 Diesel Treatment and the AR6400-D Diesel Fuel System Cleaner, is a highly effective and reliable solution for optimizing the performance and efficiency of diesel engines. With their advanced formulas, proven effectiveness, ease of use, and long-lasting benefits, this kit deserves a five-star rating. Overall rating: ⭐⭐⭐⭐⭐
Review: Best stuff I have used! - This stuff just plan works! Use to use Hot Shot products, then I tried this stuff! I have 3 diesel vehicles, Ford F-350 7.3, Audi Q7 TDI, and Sprinter. Ford was noticeably quieter, both the Audi and Sprinter were smoother running and 2-3 mph better! Don’t know how they do it but it works! Highly recommended!

## Features

- TWO-STEP FUEL SYSTEM RESET: Includes AR6400-D Diesel Fuel System Cleaner + AR6500 Diesel Treatment (40 oz) for a complete clean-and-maintain solution
- HOW IT WORKS: Use AR6400-D first for a deep clean (12 oz treats 30-40 gallons), then use AR6500 at every fill-up for ongoing protection (40 oz treats up to 400 gallons)
- FOR ALL DIESEL ENGINES: Suitable for all diesel vehicles and equipment, including modern HPCR systems
- CLEANS INJECTORS & RESTORES RESPONSE: Removes injector deposits and restores spray patterns for smoother running, improved response, and more efficient combustion
- IMPROVES LUBRICITY (ASTM D6079): AR6500 is tested to improve lubricity by 43% to protect fuel system components, including wear-sensitive parts like the CP4 pump
- BOOSTS CETANE UP TO +8: AR6500 raises cetane up to 8 points for faster ignition, smoother combustion, and improved drivability
- SUPPORTS DPF & REDUCES REGENS: Targets deposit formation to help keep the DPF clean and reduce regeneration frequency - supporting performance and fuel economy
- KEEPS TURBO CLEAN: Reduces deposit formation that impacts turbo response for restored boost and smoother acceleration

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B087JSLFNC |
| Best Sellers Rank | #400 in Automotive ( See Top 100 in Automotive ) #4 in Diesel Additives |
| Brand Name | Archoil |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,565) |
| Manufacturer | Archoil |
| UPC | 608819243825 |

## Product Details

- **Brand:** Archoil
- **Manufacturer:** Archoil
- **UPC:** 608819243825

## Images

![Diesel Fuel System Kit - AR6400-D (12 oz) + AR6500 (40 oz) - Complete Restoration For All Diesel Engines, Injector Cleaner, Lubricity Improver, DPF & Turbo Deposit Control, Cetane Booster - Image 1](https://m.media-amazon.com/images/I/71fJHWGaN0L.jpg)

## Questions & Answers

**Q: Can I use the Diesel Fuel System Kit in my vehicle?**
A: Suitable for use in all diesel vehicles, including pre-emissions vehicles and modern high pressure common-rail engines.

**Q: Should I use AR6400-D and AR6500 in the same tank of fuel?**
A: For best results, use AR6400-D in the first tank of fuel (deep clean). Then start AR6500 at the next fill-up and continue at following fill-ups.

**Q: How often should I use AR6400-D Diesel Fuel System Cleaner?**
A: Use every 5,000 miles or as required based on symptoms (declining performance, poor MPG, smoke, etc.)

**Q: Can the Diesel Fuel System Kit be used with biodiesel blends?**
A: Yes, Archoil's diesel treatments are compatible with biodiesel blends.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Optimize Performance and Efficiency
*by C***N on July 22, 2023*

Archoil Diesel Fuel System Kit, consisting of the AR6500 Diesel Treatment (40.6 oz) and the AR6400-D Diesel Fuel System Cleaner, proves to be an exceptional combination for optimizing the performance and efficiency of diesel engines. With their advanced formulas and proven effectiveness, this kit deserves a five-star rating. The AR6500 Diesel Treatment is a powerful additive designed to enhance the performance of diesel engines. It improves fuel economy, reduces engine wear, and minimizes emissions. This treatment is formulated with state-of-the-art nanoborate technology, which provides superior lubrication and protects fuel system components from wear and tear. The AR6500 Diesel Treatment also helps to prevent fuel oxidation, corrosion, and the formation of deposits, ensuring a clean and efficient fuel system. The AR6400-D Diesel Fuel System Cleaner complements the AR6500 Diesel Treatment by thoroughly cleaning the fuel system. It removes carbon deposits, varnish, and other contaminants that can accumulate over time and negatively impact engine performance. By using the AR6400-D Diesel Fuel System Cleaner, you can restore power, improve fuel efficiency, and reduce harmful emissions. This cleaner is compatible with all diesel engines, including high-pressure common rail (HPCR) systems. Both products in the Archoil Diesel Fuel System Kit are easy to use. The AR6500 Diesel Treatment can be added directly to the fuel tank during refueling, and the AR6400-D Diesel Fuel System Cleaner is added to the fuel system before an oil change. Following the provided instructions ensures proper application and maximum benefits. One of the standout features of this fuel system kit is its proven track record. Archoil is a trusted brand known for its high-quality products, and the Diesel Fuel System Kit is no exception. Many users have reported noticeable improvements in engine performance, fuel efficiency, and overall drivability after using this kit. It is particularly effective in resolving common issues such as rough idle, sluggish acceleration, and excessive smoke. Another notable advantage of the Archoil Diesel Fuel System Kit is its long-lasting effects. The AR6500 Diesel Treatment provides ongoing protection and lubrication, ensuring sustained performance benefits. The AR6400-D Diesel Fuel System Cleaner's effects can last for thousands of miles, making it a cost-effective solution for maintaining a clean and efficient fuel system. Furthermore, this kit is safe for use in all diesel engines and has no adverse effects on engine components or emissions systems. It is compatible with all diesel fuels, including ultra-low sulfur diesel (ULSD) and biodiesel blends. In summary, the Archoil Diesel Fuel System Kit, consisting of the AR6500 Diesel Treatment and the AR6400-D Diesel Fuel System Cleaner, is a highly effective and reliable solution for optimizing the performance and efficiency of diesel engines. With their advanced formulas, proven effectiveness, ease of use, and long-lasting benefits, this kit deserves a five-star rating. Overall rating: ⭐⭐⭐⭐⭐

### ⭐⭐⭐⭐⭐ Best stuff I have used!
*by M***R on December 11, 2025*

This stuff just plan works! Use to use Hot Shot products, then I tried this stuff! I have 3 diesel vehicles, Ford F-350 7.3, Audi Q7 TDI, and Sprinter. Ford was noticeably quieter, both the Audi and Sprinter were smoother running and 2-3 mph better! Don’t know how they do it but it works! Highly recommended!

### ⭐⭐⭐⭐⭐ works well
*by D***. on March 31, 2026*

Very good product I've been using this the last year or so on my Ram 1500eco-diesel.

## Frequently Bought Together

- Archoil Diesel Fuel System Kit - AR6500 Diesel Treatment (40 oz) + AR6400-D Diesel Fuel System Cleaner
- Rislone 4784 DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner, 11.8 oz
- Rislone 4780 Diesel DEF Treatment | Prevents AdBlue/DEF Fluid Crystallization, 8 oz

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-04-24*