Originally Posted by Triple_Se7en
Originally Posted by Kira
No need.
Just remember, round holes good, louvers bad.
Agree wholeheartedly.
I now trust Ecores more than squintsy, small louvers that are so inconsistentlyspread-batched at the factory.. If I had to choose one or the other, I would choose an overworked style of filter over one that has such small openings, that particles can get trapped and block passage-thru the media. Round hole sizes I use offer better odds at passages - for longer spells / OCIs. Not all round holes are the same. Get to know your filter choice prior, inside and out. I never met a louver design I liked.
If your vehicle engine is relatively clean (clear dipstick at 1+K), louvers should not hurt it. But if the engine oil gets black-dirty very early in the OCI, louvers are not your friend. I should never have to pack my magnifying glass, to inspect filter media openings at Walmart, before purchase.
Down with louvers.
FYI... Generally speaking on this type of filter the oil flows from the outside of the filter media towards the center so the only time particles could plug up the holes in the center core is if you have a failure of the media and were pushing a bunch of garbage. At which point you have more issues other than the design choice of the holes.
IF anything the louvers enhance the flow for the intended direction (ie. Out the bottom center of the filter).