Why on Engine
Every engine is equipped with a standard or full flow filter, which removes the large particles that could cause immediate damage to the vehicle. But because an adequate flow of fluid through the filter must be ensured, the filter must be highly permeable. As a result of this restriction a full flow filter can not remove particles smaller than 10 to 15 micron. However, the majority of contaminants are much smaller than 10 micron and will therefore easily pass through a standard filter. 90% of engine wear is caused by particules between 2 and 5 micron in size.
The NTF filtration system removes contamination particles down to 0.5 micron in size. The reason for adding a NTF filter to your existing system is to clean the fluid, allowing the engine to run on clean oil 100% of the time. By keeping the oil clean you are eliminating over 90% of most engine wear.
Why on Hydraulics and transmissions
Electrically operated valves and cylinders have clearances around 4 microns in size while standard factory filters are usually designed to filter down to 8 microns ,sometimes even only up to 10 to 15 microns.
This makes it a matter of time until the hydraulic valves start to malfunction. They get sticky, less responsive or will block alltogether. To avoid these problems and to avoid high repair costs and downtime, additional filtration down to at least 4 microns is imperative. Failing to do so will result in high repair costs and downtime! In order for valves and cylinders to function properly an ISO-cleanliness class of minimum 19/16/13 is required. However in practice this usually is 21/20/15.
The NTF filtration system removes contamination particulates down to 0.5 micron in size. The reason for adding a NTF filter to your existing system is to clean the fluid, allowing the hydraulic system to run on clean oil 100% of the time. By keeping the oil clean you are eliminating over 80% of most common malfuctions in hydraulic systems and transmissions.