There are no oem replacement filters that filter to less than 15 microns "Absolute" available on the market today. You may be looking at the "Nominal" rating which is only what the filter can filter 50% of the time. The Absolute rating is what the filter can filter 98%+ of the time. That is the key rating you want to find out when choosing a filter.Why not use a relatively inexpensive oil filter as a primary, inline prefilter on a duramax? I know the Fram filters are generaly considered poor but it is easy (and cheap) to get a adaptor for one and you could use whatever make of filter that turns your world! GOOD quality oil filters in the 5- 10 micron rating can be had for $3 to $8 dollars and would likely prolong the oem filter change interval by multiples! Any reasons why this won't work?
Got it I was confused. :boobooI am talking about using a oil filter as a fuel prefilter to extend the life of the expensive oem fuel filter on our trucks. common oil filters are very cheap by comparison and should filter out a significant portion of contaminants from the fuel. would they really know whether they were filtering oil or diesel fuel?
The gold Baldwin actually did very poorly in the filter shootout. Not sure if you saw that. The water separator flat out didn’t work. The ac Delco, red Baldwin and Donaldson did the best.Amsoil makes one of the worst diesel motor oils so I would not look to them for an oil filter. Baldwin BF9882 "2 micron" fuel filter as it provides better filtration than the OEM filter and does not disable the fuel water sensor. Fuel filters may state that they are rated for 4 microns but that does not mean that they capture 100% of the particles larger than 4 microns as none of them can do this. Even if they filter 98.7% of the particles from diesel fuel that still means that for every gallon burned more than 240,000 particles are going to the high pressure rail and hitting the injector solenoids at 42,000 PSI.
Fuel filters are least effective when they are new and before any media loading has taken place. Best to go by the DIC as it is a better indicator of fuel consumed which is not accurately reflected in the miles driven. My truck gets 30% fewer miles per gallon when towing a heavy trailer and that so the filter is having to clean a lot more diesel for every mile driven.