oil filter capacity
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New User
Joined: Jan 2002
Posts: 15
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From: Troy USA
oil filter capacity
Does anyone know how full or maybe 'clogged' an oil filter would be on a hypothetical engine - lets say a healthy 5.0 V8 with 50,000 mi at the end of a normal (3-4k mi) oil change interval? Assuming no engine catastrophy has taken place, would the filter have relatively the same differential pressure as when new, or is flow significantly compromised due to the filter being full of particles from doing its job? Basically, does enough crud/particles, etc get filtered out over the course of a normal oil change interval to significantly reduce the flow through the filter?
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
oil filter capacity
I would worry more about the filter element starting to fall apart. Going over 3k or so on an oil filter not specifically designed for it (if there is any) isn't really a good idea.
Junior User
Joined: Jan 2002
Posts: 72
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From: Oshawa Canada
oil filter capacity
Oil filters are designed one of two ways. The first way is when the oil filter is full, it will open up and dump all the crap in the engine then start over. The other way is when the oil filter is full, it will by-pass the element inside, so no more filtering is done.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
oil filter capacity
>Oil filters are designed one of two ways. The first way is
>when the oil filter is full, it will open up and dump all
>the crap in the engine then start over.
How exactly is that accomplished? What brand does that?
As soon as one hole in the filter media is plugged with a particle from the engine, the performance and filtering capability goes down. Just like a vacuum cleaner bag or filter. Although the dynamics of fluid is much less "forgiving" than air. Since many manufacturers only specify filter changes every other oil change (why, I don't know) it's assumed that filters have a rather long expected life for filtering effeciency. Flow is indeed restricted after a while, dictating the need for bypass valves. The only real way to find out just how much, is a side by side comparison with a machine that tests these things. Many manufacturers of filters closely guard this information, as it is a two-edged sword.
>when the oil filter is full, it will open up and dump all
>the crap in the engine then start over.
How exactly is that accomplished? What brand does that?
As soon as one hole in the filter media is plugged with a particle from the engine, the performance and filtering capability goes down. Just like a vacuum cleaner bag or filter. Although the dynamics of fluid is much less "forgiving" than air. Since many manufacturers only specify filter changes every other oil change (why, I don't know) it's assumed that filters have a rather long expected life for filtering effeciency. Flow is indeed restricted after a while, dictating the need for bypass valves. The only real way to find out just how much, is a side by side comparison with a machine that tests these things. Many manufacturers of filters closely guard this information, as it is a two-edged sword.
Posting Guru
Joined: Feb 2001
Posts: 1,016
Likes: 1
oil filter capacity
I would have to disagree on that. Oil filters work like air filters and when you start to get dirt in the filters the filters actually work better at cleaning out the oil and air. The dirt starts to act like filter materal and catches other dirt. This method works great until you get saturated with dirt and then on the oil filters the pressure builds up and with to much pressure the by-pass valve opens and causes unfiltered oil to flow into the engine.
>As soon as one hole in the filter media is plugged with a
>particle from the engine, the performance and filtering
>capability goes down.
>As soon as one hole in the filter media is plugged with a
>particle from the engine, the performance and filtering
>capability goes down.
