---
product_id: 718604293
title: "Archoil AR6500 Diesel Treatment (40.6 oz) - Treats 400 Gallons - Additive for All Diesel Vehicles"
brand: "archoil"
price: "€ 120.59"
currency: EUR
in_stock: true
reviews_count: 5
category: "Archoil"
url: https://www.desertcart.ie/products/718604293-archoil-ar6500-diesel-treatment-40-6-oz-treats-400-gallons
store_origin: IE
region: Ireland
---

# Strong cetane boost for power & response Cleans post-combustion system (turbo, DPF) 40.6 oz treats 400 gallons Archoil AR6500 Diesel Treatment (40.6 oz) - Treats 400 Gallons - Additive for All Diesel Vehicles

**Brand:** archoil
**Price:** € 120.59
**Availability:** ✅ In Stock

## Summary

> 🚛 Unlock peak diesel power and efficiency — don’t let your ride fall behind!

## Quick Answers

- **What is this?** Archoil AR6500 Diesel Treatment (40.6 oz) - Treats 400 Gallons - Additive for All Diesel Vehicles by archoil
- **How much does it cost?** € 120.59 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/718604293-archoil-ar6500-diesel-treatment-40-6-oz-treats-400-gallons)

## 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

- • **Turbo & DPF Savior:** The only additive that cleans post-combustion components to prevent costly failures.
- • **Maximize Every Mile:** Treats up to 400 gallons per bottle for long-lasting fuel efficiency.
- • **Fuel System Guardian:** Cleans, lubricates, and protects injectors, pumps, and fuel lines to extend engine life.
- • **Power & Performance Boost:** Incorporates advanced combustion modifiers and cetane boosters for sharper throttle response.
- • **Engineered for Modern Diesels:** Specifically formulated to tackle issues with today’s diesel fuels and HPCR systems.

## Overview

Archoil AR6500 Diesel Treatment is a premium 40.6 oz additive designed to treat 400 gallons of diesel fuel. It uniquely cleans post-combustion systems like turbos and DPFs, boosts cetane for improved power and throttle response, and protects modern high-pressure fuel systems. Trusted by thousands, it delivers measurable MPG gains and engine longevity when used consistently at every fill-up.

## Description

Archoil's AR6500 Diesel Treatment has been formulated to address issues associated with modern diesel fuels. AR6500 incorporates the most powerful and advanced diesel additive chemistry that is currently available. Only 100% active ingredients are used with no fillers, offering greater value per fill up. AR6500's detergents and lubricants have been engineered to clean, lubricate and protect your fuel system including injectors, pumps, lines and tank in all systems including the latest high pressure common-rail injection fuel systems. AR6500 also incorporates Archoil's proven combustion modifier technology and a strong cetane boost to increase power and response and reduce soot and carbon build-up in turbos, DPF and EGR components. 1 oz of AR6500 treats 10 gallons of diesel.

Review: I suspect my Audi 3.0 TDI had a clogged cat some 5 years after a DPF delete back in 2019. MPG was down and it felt like it was also down on power. Sometimes the "Italian Tune-up" (high rev driving) would briefly help by blowing a lot of crap out the back, but it would go back to reduced after a day or two. I had been using the Hotshots Every Day in each fill-up, which may have slowed this issue down but it still happened. I also tried Opti-Lube XPD for a few months. Not much, if any, improvement. I do suspect they helped improve cetane values, but idk what else. If I had a good run, I was getting ~560 miles per tank. After some YouTube videos, I decided to try Archoil. I didn't notice anything for a couple fill-ups, but after about 1-1.5 months, I started to notice some slight improvements in mileage to/from work and some other trips. It was getting hard to hit 30 mpg on the way to work, whereas I started hitting 31-32, even with significant traffic. After 2 months, there has been a definite improvement. I'm currently seeing 33+ mpg on the way to work (same conditions as before) and reaching closer to the 38 mpg EPA advertised on my way home. I've also hit 42 mpg coming home from a friends' house, whereas before it was struggling to hit 39. Power feels like it has returned to expected levels compared to the previous treatments. My range is now reporting >600 miles per tank, even dealing with some stop and go traffic. For the results, price, and ease of applying into the tank, I highly recommend using it and I intend to continue using this from hereon out.
Review: This seems to work really well. Just started using this especially for this winter season. Seems to improve mileage.

## Features

- 40.6 oz bottle treats 400 gallons - Use at every fill-up
- Formulated to address issues with modern diesel fuels to restore and maximize performance and fuel economy (MPG)
- The only diesel treatment to clean the post-combustion system (turbo, DPF) to prevent premature failure and reduce regeneration frequency
- Incorporates Archoil's proven combustion modifier technology and a strong cetane boost to increase power and response
- Cleans, lubricates and protects your fuel system (including HPCR systems)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09KS9JMDP |
| Best Sellers Rank | #163,154 in Automotive ( See Top 100 in Automotive ) #432 in Oil & Fluid Additives |
| Brand | Archoil |
| Customer Reviews | 4.7 4.7 out of 5 stars (2,670) |
| Date First Available | 16 December 2024 |
| Item Weight | 1.34 Kilograms |
| Item model number | AR6500-40 |
| Manufacturer | Archoil |
| Manufacturer Part Number | AR6500-40 |
| Package Dimensions | 33.4 x 18.7 x 8.5 cm; 1.34 kg |

## Images

![Archoil AR6500 Diesel Treatment (40.6 oz) - Treats 400 Gallons - Additive for All Diesel Vehicles - Image 1](https://m.media-amazon.com/images/I/61PN0hNSMfL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Can it be used in my vehicle?**
A: AR6500 is suitable for use in all diesel vehicles, including newer systems such as High Pressure Common Rail.

**Q: What's the difference between AR6500 Diesel Treatment and AR6400-D Diesel Fuel System Cleaner?**
A: AR6400-D is a one-tank treatment that rapidly deep cleans the entire fuel system. AR6500 is a on-going maintainance treatment that improves fuel quality at every fill-up. For best results, use both with the Diesel Fuel System Kit.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by B***B on 23 September 2025*

I suspect my Audi 3.0 TDI had a clogged cat some 5 years after a DPF delete back in 2019. MPG was down and it felt like it was also down on power. Sometimes the "Italian Tune-up" (high rev driving) would briefly help by blowing a lot of crap out the back, but it would go back to reduced after a day or two. I had been using the Hotshots Every Day in each fill-up, which may have slowed this issue down but it still happened. I also tried Opti-Lube XPD for a few months. Not much, if any, improvement. I do suspect they helped improve cetane values, but idk what else. If I had a good run, I was getting ~560 miles per tank. After some YouTube videos, I decided to try Archoil. I didn't notice anything for a couple fill-ups, but after about 1-1.5 months, I started to notice some slight improvements in mileage to/from work and some other trips. It was getting hard to hit 30 mpg on the way to work, whereas I started hitting 31-32, even with significant traffic. After 2 months, there has been a definite improvement. I'm currently seeing 33+ mpg on the way to work (same conditions as before) and reaching closer to the 38 mpg EPA advertised on my way home. I've also hit 42 mpg coming home from a friends' house, whereas before it was struggling to hit 39. Power feels like it has returned to expected levels compared to the previous treatments. My range is now reporting >600 miles per tank, even dealing with some stop and go traffic. For the results, price, and ease of applying into the tank, I highly recommend using it and I intend to continue using this from hereon out.

### ⭐⭐⭐⭐⭐ Review
*by D***Y on 26 January 2026*

This seems to work really well. Just started using this especially for this winter season. Seems to improve mileage.

### ⭐⭐⭐⭐⭐ Review
*by J***Y on 25 February 2026*

Works well in our diesel pickup

## Frequently Bought Together

- Archoil AR6500 Diesel Treatment (40.6 oz) - Treats 400 Gallons - Additive for All Diesel Vehicles
- Archoil AR9100 Friction Modifier Value Pack - Two 16oz Bottles of AR9100 for Two Powerstroke Treatments…
- Archoil AR6400-D Diesel Fuel System Cleaner (Two Pack) - Cleans Injectors, Turbo & DPF

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-18*