I happened upon a pretty convinving argument that putting a filter mag on the exterior is not only "not" useful and not as effective as "dropping IN a magnet"... it also can be harmfull........
QUOTE >>>> LINK TO CLAIMS
Let's take a look at a cut open oil filter
wrapped in an external Filter Magnet type product.
Where is all the metal deposited?
You are being tricked they show the larger metal particles that have not reached the oil filter element yet. Remember that if you can see metal it is larger than 50 microns, so all of these loose chips of metal would have been caught by the paper media.
Truth is you should never collect metal before it passes into and through the media. What you want to collect with a magnet is any particles that are so small, they go through the media. The ones that are 5, 10 or 15 microns, the ones the SAE documents below say are responsible for 80% of your engines wear.
A more important issue is engineering! These products are in direct conflict with the design an OE Filter company builds into their products.
Note above that oil flows from the outside to the inside of filter but also note the space between walls and media paper, it is extremely tight and narrow.
Now note where the ragged, rough large metal particles are deposited. They all end up in nice little rows along the inner wall of the filter's metal shell. Well those walls are factory finished with high tech paint like coatings that seal and smooth the raw steel so it is virtually a zero friction component.
FACT: The faster and easier the oil flows up the side wall and then into the paper media, the less Horse Power (ie Gasoline) it takes to pump the oil.
The last thing you or the filter manufacturer wants is a rough surface on the inside of that can, it just does not make good sense on any level. Let the filter do it job of removing larger particles and then let our Ceramic Oil Filter Magnets clean up what the spin-on unit misses... it's a winning combo!
END QUOTE
QUOTE >>>> LINK TO CLAIMS
Let's take a look at a cut open oil filter
wrapped in an external Filter Magnet type product.
Where is all the metal deposited?
You are being tricked they show the larger metal particles that have not reached the oil filter element yet. Remember that if you can see metal it is larger than 50 microns, so all of these loose chips of metal would have been caught by the paper media.
Truth is you should never collect metal before it passes into and through the media. What you want to collect with a magnet is any particles that are so small, they go through the media. The ones that are 5, 10 or 15 microns, the ones the SAE documents below say are responsible for 80% of your engines wear.
A more important issue is engineering! These products are in direct conflict with the design an OE Filter company builds into their products.
Note above that oil flows from the outside to the inside of filter but also note the space between walls and media paper, it is extremely tight and narrow.
Now note where the ragged, rough large metal particles are deposited. They all end up in nice little rows along the inner wall of the filter's metal shell. Well those walls are factory finished with high tech paint like coatings that seal and smooth the raw steel so it is virtually a zero friction component.
FACT: The faster and easier the oil flows up the side wall and then into the paper media, the less Horse Power (ie Gasoline) it takes to pump the oil.
The last thing you or the filter manufacturer wants is a rough surface on the inside of that can, it just does not make good sense on any level. Let the filter do it job of removing larger particles and then let our Ceramic Oil Filter Magnets clean up what the spin-on unit misses... it's a winning combo!
END QUOTE
