Your next tank of diesel could be lurking with water, microbial growth (bugs) or tiny particles that the factory filter never picks up - They can all destroy your fuel injection system! Dont risk it, get extra protection to save it.
One way to provide the best protection your engine is to install an additional fuel filter and water sperator. All common-rail systems only have one factory filter, so installing the additonal filter is a must.
The Secondary (Final) filter is plumbed after your factory filter as a last line of defence the secondary filter in both 2 micron and 5 microns for V8 applications will effectively remove any water or contaminates that make it past your factory filter.