OEM-Level Reconditioning
Catalytic Recovery
Restore precious metal Catalytic Performance
Diesel Oxidation Catylists (DOC) | Coated DPF

All Diesel Oxidation Catalysts (DOCs) and some Diesel Particulate Filters (DPFs) are treated with a fine coating of microscopic precious metals "flakes" such as Platinum, Palladium, and Rhodium. The chemical properties of these precious metals allow them to interact with certain elements of the exhaust stream to promote soot burn-off inside the DPF and reduce the emission of NOx and CO from the tailpipe.

The majority of this work is done within the DOC in most exhaust system designs. Other manufacturers will add a diluted coating to DPF to further fine-tune NOx and/or CO before exiting the tailpipe. These are most often encountered in powertrains that were retrofitted with DPF or do not have a SCR module installed.

When other methods fail, Stage 3 Wet Cleaning can recover your investment in these DPF and DOCs.

  • Dissolve Hardened Ash plugs and scale - If the exhaust stream can't reach the catalytic coating, the coating can't do its job - plain and simple.  Stage 3 wet wash can dissolve those hardened ash plugs and scale that become too dense to allow the exhaust stream to be "scrubbed" by the precious metal wash coat.  Removing these ash plugs and scale helps restore catalytic performance.
  • Removal of Catalytic Contaminants - Contaminants from un-approved additives and high-sulphur fuel can chemically combine with the precious metal wash coat, making it chemically "inert".  When these flakes or granules of precious metals are inert, they cannot interact with the exhaust stream to do their job, reducing catalytic performance.  The cleaning chemicals used in FSX Stage 3 wet wash are OEM proven to chemically strip these contaminants from the prescious metal wash coat, returning these sites to the usable inventory of catalytic activity, restoring catalytic performance.

Tech Note
Catalytic Contaminants VS Poisons

  • Poisons are permanent (chemical) changes to the Catalytic wash coat that reduce its effectiveness at NOx and CO reduction below acceptable tailpipe emissions standards.
  • Contaminants are essentially Poisons that can be removed, but have the same chemical impact to the Catalytic wash coat.

Chemicals such as Sulphur, Phosphorus, Phosphates, and other compounds were (and often still are) referred to as catalytic Poisons. The use of high-sulphur fuel or non-approved fuel additives can introduce these compounds to the exhaust stream, allowing these compounds to "bind" with the catalytic wash coat. This in turn prevents the catalytic coating from interacting with the exhaust, increasing NOx and CO emissions out the tail pipe.

Due to advances in cleaning technology and our understanding of the chemical processes involved, most "Poisons" are actually removable, allowing them to be re-classed as Contaminants. The ability to sucessfully remove these contaminants allows you to keep that DPF or DOC in service instead of scrapping it and buying a new one as previously done.