Rando:
"Total" design of the element, by-pass, and anti-drain varies from manufacturer to manufacturer within the can itself.
I do not question personal experiences. However, is it not reasonable to think that there are many others in America that own the same vehicle/engine and not experience the rattle noise using Fram? I'll anticipate your responce as being it's because that's what they expect so they don't switch to another brand.
Fram has designed their by-pass to fit in their element and their anti drain to cover the inlet holes as a complete unit.
While you , and some others, keep claiming I don't "blame" the filter...can you not also consider every engine built is not exactly the same either.
There are anomolies that happen.
If various car manufactureres have cars returned under lemon laws, does that mean you won't buy their car? If so..your selection of vehicle manufacturers may be severly limited.
Filter companies do warranty their filters.
But every filter brand that uses buna/nitrile rubber anti-drain will have a potential for leaks under certain conditions as the OCI is reached or extended. Extreme heat or cold effects the compound. Everyones compound. Certain extra added additives can effect the anti-drain. Not to mention sludge that or contaminant that becomes lodged in a critical area.
---------------------------------------
Gary:
I've kinda answered this before in another thread.
I went through some of the things that make up a spec..but not actually posted the "numbers". The reason I don't post the numbers is because I don't have them..lol.
The anti-drain must not leak X amount of oil in Y amount of time.
By-pass settings are OEM specified. The reason that "some" catalogs have different opening setting ratings is the different flow rates at which that company tests it's valves. ( in most cases)
Filter Companies are aware of the OEM OCI and requirement for minimum dirt holding capacity. This is a test whereby at a certain termination point pressure drop across the element, the filter must have retained X grams of contaminant. The pressure drop figure is when the OEM considers the element to be "to dirty". In actual fact the element still has "life" left and no OEM has the filter run until plugged. ( unless things have changed since I left but I doubt it)
This is done to minimize the by-pass opening up to much. An argument which is fun to read in here as to who believes how much a by-pass opens up and for how long. Those who extend their oil drain intervals have a greater potential for their by-pass opening more often and longer should their filter "see" more contaminant. Again, only the owner probably knows the maintenance practices he/she uses.
Media efficiency "spec" is actually low/moderate for OEM's. It is the aftermarket which fuels the high efficiency race.
It is also the filter companies who created the "Micron" monster and now "Beta" monster.
As far as I know, not one OEM requires a certain micron or beta for the media in their oil filter.
( air filters never have been rated by "microns"..fwiw)
How that all came about is because the micron rating was a by-product of the testing to meet or exceed performance specs. It was a simple tool for simple folks..like salesmen and marketing departments. And now internet users.
Err..gotta go to work now. I'm in Little Rock. Ark. Maybe i'll add more later..