Originally Posted By: UncleDave
Originally Posted By: goodtimes
The outer element could be made to work like the round disk on their others. Whether it does is another story. I think from their stated work they did more than put foam around the filter and called it a day.
I would worry if the foam filter contacts the canister walls and inhibits flow more than anything else.
I'll order one that theoretically fits my sprinters take a look at it and report.
There are a bunch of ways they could make it work, but Ive paid little attention to cartridges while my MB's ares under a factory service plan.
UD
It would work if the foam performs depth filtering effectively.
Also, if the foam shifts down, it looks bad, but think of what actually happens to the fluid flow:
---Fluid Path "A" travels through the main media (not the foam)
--------Path A is low resistance, so like a parallel electrical circuit, most (say 99%) passes thru Path A here.
---Fluid Path "B" travels through the scrunched-up depth foam, high resistance, low flow (like 1%)
--------Depth filtering thru the foam allows small engine varnish or sludge particles to lodge inside the foam, increasing filtering of smaller particles over time.
Notice how the 99% "A" path flow, and the 1% "B" flow parallel path actually resembles the teflon disc method.
The only question is how effective is the foam at grabbing 2 micron particles? I think it has to age slightly in the presence of carbon, varnish, and sludge particles to allow it to capture the small 2 micron stuff in the later half of the oil change interval when its really needed the most.