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By-pass Oil Filter


The SDU-M8 is a by-pass filter suitable for systems of up to 40 litres of oil. Max input pressure 2-6 bar.

Supplied with 1x CARDEV SDFC Filter Element.

Benefits include:

  • Removes microparticles including combustion deposits
  • Removes free and dissolved water contamination
  • Increases engine reliability
  • Prevents engine corrosion
  • Reduces component wear
  • Extends oil life and generates CO2 saving
  • Reduces operating costs

For more information call us on
01423 522911


  • Input pressure 2-6 Bar
  • Up to 99.9% water removed (both free and dissolved water)
  • Particle contamination (including combustion deposits) removed
  • Oil life can be extended by up to 4 times


  • Earth moving machines
  • Forestry equipment
  • Rail maintenance machines
  • Drilling/pilling equipment
  • Marine
  • Gensets
  • Truck and bus fleets


Dimensions (mm):

H: 308 D: 217

Flow Rate (l/m):

120-240 (Max)


Inlet: 1/4″ BSP (m)
Outlet: 1/4″ BSP (m)

Weight (kg):


Filter Element Type:

Standard Fit 1 x SDFC (Oil based fluids)

Filtration Results

Particles Removed

100 times magnified, 1 scale mark = 10μm. Oil cleanliness is maintained at better than new levels. (Down to 13/11/8 (ISO 4406: 1999) – Class 2 NAS 1638).

Before using CARDEV Filtration

After using CARDEV Filtration

CARDEV Case Study

Oil consumption was reduced by 75%, generating a CO2 saving of over 75% when compared to engines without CARDEV filtration.

Call us now 01423 522911

Each SDFC Filter Element Can Remove Up To

Particle Contamination

Water Contamination

Contact us now for pricing in your workshop.

Download the SDU-M8 datasheet

Download Datasheet

Other Products Similar To The SDU M8

Cleaning and recycling oil can be easy


By-pass Oil Filter


By-pass Oil Filter

CARDEV Filter Element Change 1:29

Our step-by-step video shows the correct way to replace a CARDEV SDFC filter element.

Frequently Asked Oil Filtration Questions

What is contamination?

Contamination can be broken down into three basic forms – Particulate, Water and Air.

Particulate is generally classified as ‘Silt’ or ‘Chip’. Silt is defined as an accumulation over time of particulates measuring less than 5 microns. The effect of Silt contamination is a slow degradation of system component performance and failure. Chips (measuring more than 5 microns) have a more dramatic effect and can cause immediate, catastrophic, unplanned and costly failures.

Where does contamination come from?

There are many areas where contamination can gain access into a hydraulic system, starting from as early as the build process. These include dust, welding slag, rubber from hydraulic hoses/seals, sand from castings, poor cleaning of components, and metal debris from machined components.

Open reservoir filling points, leaking heat exchangers, poor-performing or non-existing reservoir breathers, lack of proper filtration methods and worn cylinder seals are just some of the additional areas contaminants can enter during operation.

Another major source of contamination introduction simply happens when fresh, new, but dirty, contaminated oils are introduced. This can even happen during system top-ups.

How are contamination levels measured?

The following chart (ISO And NAS Cleanliness Codes) details the ISO code, relevant particle amounts and the type of application and its sensitivity level. More sensitive applications require cleaner oil to ensure reliability.

Can I trial CARDEV Filtration?

Absolutely. To avoid wasting anyone’s valuable time, however, we like the trial to be towards the end of the consultation process, to provide proof of concept. This means we will have gone through pricing with you, and we will have established criteria for a successful trial.

Why buy more oil when you can recycle the oil you have using CARDEV Filtration

Contact us now for pricing.

Tell me more about CARDEV Filtration

Need help

Call one of our Filtration specialists now.
Call 01423 522 911.

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Personal Setup

We’ll show you how to get the best out of your CARDEV products.