I just ordered 20 of these Bosch Fuel Filters (W0133-1641619) for my '85 300D TD. I'm going through them about every 30 miles, since last fuel fill, probably because I didn't pre-filter the oil enough. Anyone have any idea what the Micron rating on these inline filters is? I want to know so I can set up my pre-filtering system to use them more efficiently. I was running my oil through a Racor 2 micron fuel/water separator/filter, but was impatient on the last tank when that element clogged, and pumped directly from my finishing tank (post upflow settling, with simple stock screen on Tuthill pump hose). I've looked around online, and while I find many sellers of these filters, I find no info on their micron rating. My conversion system uses two (I bought the car already converted), one immediately after entering engine compartment, and one after the veg-therm.
I've read through all the posts on this part of the forum to no avail.

Your Thoughts much appreciated,

Stock main filter is 10,Primary is 40 micron..Thats why its important to add a better filter before stock one.Ma Benz should have used a water seperator too.