http://home.stny.rr.com/jbplock/ISO5011/SPICER.htm

Filter Efficiency is a measure of the filters overall ability to capture dirt.


In the chart below it’s important to note the different test durations for each filter. The AC Delco filter test ran for 60 minutes before exceeding the restriction limit while the AMSOIL and K&N tests each ran for 20 and 24 minutes respectively before reaching max restriction. In 60 minutes the AC Filter accumulated 574gms of dirt and passed only 0.4gms. After only 24 minutes the K&N had accumulated 221gms of dirt but passed 7.0gms. Compared to the AC, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt.

Does AC Delco make cone type filters?

Edit: Nevermind

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

I'm sure you could find a round type with a 2 - 2.5 - 3" mouth that would seal well on the tube. That's what I'm doing, for now...

The Amsoil filter tested here is the oiled foam TS series and the TS123 is used in later model GM pickups and SUVs. They have a new nanofiber filter (EaA series) and I would like to know if anyone knows of any test data like the above with the newer series filter results. Not the "results" from the Amsoil tests but some independent comparisons. Out of curiosity go to amsoil.com and see what they say about their new filters.
Thanks.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".