Granted, I do not own a 6.4 but have done a little research on bypass kits. That site posted in the first post does not say how many microns that filter is. Maybe it does and I missed it. To me it looks like a basic oil filter with Amsoil written on it. If its the same as the motor filter then whats the point? Your just double filtering the same oil of the same micron size. Pointless. Depending on the micron size of the filter, IMO, bypass filters are a good idea. That's why I chose the FS2500. I wasn't really after extended changes, just clean oil. But, I installed the kit and did an oil analysis. Ran 5000 miles and changed all filters including the FS. Ran 5k more and did a sample. Was directed to go 4k more and resample. Per my oil analysis results, I'm able to go around 8 thousand miles on my oil. This was because my viscosity was pretty much done compliments of my high pressure oil pump! (7.3) My opinion, if the bypass filter isn't filtering a smaller micron size compared to the stock filter, the bypass kit is pointless. Again, just my opinion.
