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Archoil AR6400-CR Professional Common Rail Diesel Cleaner

AR6400-CR is a powerful next-generation fuel additive blended from the latest high-strength polyetheramines and PIBSA/PIBSI detergents and that quickly and safely remove gum, varnish and carbon deposits.


RRP: £24.14

Our Price From Excl. VAT: £16.46 From Incl. VAT: £19.75

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Product Description


PLEASE NOTE: This product has now been replaced with AR6400-D, which is compatible with all diesel fuel system types, including common rail.

AR6400-CR is a powerful next-generation fuel additive blended from the latest high-strength polyetheramines and PIBSA/PIBSI detergents and that quickly and safely remove gum, varnish and carbon deposits from high-pressure common rail fuel systems and engines.  Advanced combustion modification chemistry then maximizes combustion performance to help remove post combustion hydrocarbon build-up whilst rapidly reducing harmful exhaust emissions.

AR6400-CR quickly restores lost engine performance and fuel economy in addition to unique properties that help protect surfaces from further deposit build-up.  Molecule by molecule deposits are safely removed from the entire fuel system and combustion area thus improving combustion efficiency and enabling emission control systems such as the DPF to operate more efficiently. AR6400-CR is suitable for all common rail diesel engines running on pump, bunkered or bio-diesel blended fuel.


  • Cleans harmful deposits and prevents future accumulation
  • Increases cetane value by up to 7 points
  • Restores fuel efficiency
  • Restores fuel economy
  • Restores power and performance
  • Smoothes rough idling
  • Lowers harmful exhaust emissions
  • Lubricates and protects the fuel system

HISTORY: The first family of dispersant/detergents were amines with a polyisobutylene (PIB) tail.  The PIB tail gave good solubility and the amine group provided surface activity that lifted deposits from the metal surface.  However the PIB tail, as a polymer, gave the undesirable effect of stickiness so the PIB amine had to be combined with a fluidizer to ensure that it flowed through the combustion region of the engine and did not build up any residues.  The fluidizer was typically a polyolefin epoxide. The next generation of chemistries combined the fluidizer with the polymeric amine.

These are called polyetheramines or PEA.  Polyetheramines do not require the addition of a fluidizer and the oxygen content provides enhanced surface activity.  PIB amines are still widely used in gasoline and perform well. However, PEA’s offer improved combustion chamber cleaning efficiency but is considerably more expensive.  There is an abundance of supply of PIB amines unlike with PEA; hence the treatment cost is significantly higher.  Therefore, PEA’s are not widely found in low cost cleaners or are found in reduced quantities.  AR6400-CR contains the highest safe amount of PEA and accompanying chemistry to safely move deposits.




  • Add the correct amount of AR6400-CR to the fuel tank first and then fill up with fuel immediately afterwards.
  • Treatment ratio is 1:100 > 1:200.  A single 430ml bottle will treat between 43 and 86 litres of fuel.  A 5 litre container will treat up to 1000 litres of fuel.
  • Use every 5000 miles or use once and follow up regularly with Archoil AR6200-EU,  AR6300 or AR6800.


Product Attachments

View FileArchoil Product Benefits and Application Guide    Size: (1015.8 KB)


Customer Reviews (1)

ARCHOIL© AR6400 and AR6400-CR Review by Peter Holdstock
“I have used the standard AR6400 through my Freelander TD4 with 98k on the clock and with excellent results. However, I have noticed that there is an AR6400-CR for Common Rail diesels which the TD4 is, my question is, what it the difference between the two products?

I had great results from the standard (as well as the turbo clean and oil additive), used in combination I have actually improved the performance and mpg from when I bought the Freelander 8 years ago with 29k on the clock.”
(Posted on 05/01/2016)

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