CRT® Operating Conditions

The CRT® process - Continuously Regenerating Trap – depends upon regeneration of the filter, which prevents large accumulations of soot and eventual filter blockage. Excessive engine smoke, oil consumption or high sulphur fuel can prevent the CRT® system from operating satisfactorily.


  • Use only diesel fuel with sulphur content less than 50 ppm and conforming to EN590
  • Do not use fuel additives other than those already incorporated in general commercial diesel fuel supplies.
  • Additionally the following biodiesel and water-diesel emulsion fuels are approved for use with CRT® technology: 
30% Diester
Greenenergy Global Diesel, 5% biodiesel, 95% ULSD
Global Commodities UK Ltd, driveEco
Rix Biodiesel Ltd, Bioblend 5
Petroplus Marketing Ltd, Bio-plus
Water-fuel emulsions
BP Aspira @ 10% demineralised water
Lubrizol PuriNOxTM @ 10% demineralised water

Engine Smoke

The level of smoke produced by the engine should not exceed the maximum limits set by the engine manufacturer.

Engine Oil

Low ash oils are recommended to maintain the filter service interval and optimal SCRT® performance.

  • Use only engine oil with a sulphur content of less than 7,000 ppm.
  • Ensure engine oil consumption is within engine manufacturers limits, typically less than 1 litre per 1,000 km.

During normal operation, ash, which is an incombustible material (mainly the residues of burnt engine oil), can gradually build up in the filter. This is removed by regular servicing.

Click here for more information on System maintenance

Click here for more information on Eminox Filter Servicing.

Vehicle Operation

  • The vehicle must be serviced according to manufacturer’s recommendations in order to maintain the optimal engine performance, which the CRT® system is designed to be compatible with.
  • Repeated long periods of engine idling should be avoided. This can lower the engine temperature below that required for filter regeneration, causing soot to accumulate and block the filter.