Questions normally put to us regarding diesel fuel:

What is clean fuel?
Diesel is sold in South Africa with a fuel rating 500 /50 /10 PPM. This PPM rating relates only to the Sulphur levels in the diesel.

Does this mean dirt in the diesel?
No, this is not the dirt content of the fuel.

What should be the ISO cleanliness of the diesel be?
For the new Euro 3 and 4 specified engines it must be ISO Code 12/10/8

What is the fuel at the forecourt?
What we have measured at forecourts is between ISO Code 21 /18 /15 and 19 /15/ 12

What is the micron rating of the OEM (original engine manufactures) filters?
The OEM filters filter down from 8 to 4 micron.

What is the tolerance in a high pressure injector (Euro 3 to 4 specification engine)?
The injector tolerances are between 1.8 and 2.5 micron

What causes the injector to wear?
First part of the injector change is termed “stiction”. This is when the dirt particles entering the injector cause the moving parts to slow down – this in turn changes the timing of the injector and spray pattern, causing resultant drop in performance, decrease in fuel efficiency and an increase the exhaust gas temperature.
The next part of the wear is barrel wear and spray hole wear. This causes over fuelling and engine failure.

If the injectors are worn, will fitting a filter help?
It will not improve your fuel consumption but maintain it at the level that it is.
If UDF fuel filters are fitted from new, the fuel consumption will remain as new and maintain oil and motor condition for a much longer period.

Will it affect my warranty?
No, most of the OEM’S do not have a problem with fitting extra filters on the fuel side.


Can I fit UDF filters to my petrol engine?
Yes you can as UDF fuel filters are designed to be used for both diesel and petrol engines.

Will it improve my fuel consumption?
Yes it will as the OEM petrol fuel filter is a 20 micron filter and filtering the petrol keeps the carbon levels down and keep the Lambert sensor clean which keeps injectors in spec and maintains fuel consumption.

UDF filters can be used with all types of fuel as all our components are compatible.