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Magnets … to filter & clean your oil

It’s a fact that as your engine runs, tiny metallic particles along with the soot from the combustion process become suspended in your circulating oil.  That’s the nature of an engine where metal on metal contact occurs. The engine oil attempts to create a lubricating buffer between the metal parts to reduce friction, thus extending the life of the engine.  Your oil filter’s mesh membrane does it’s part in capturing particles down to about 10 microns, but what about particles less than 10 microns in size?  What about the worst kind of particles, the tiny metallic pieces of steel that used to be part of your ending’s moving parts?  If they are small enough, they continue to float around in the oil and passing through your oil filter creating further wear as that fine film of oil separating the moving parts carries not only the fine abrasive soot that turns your oil black, but also fine metal particles.
If you’ve ever seen a magnetic oil drain plug, especially those that come off of a differential plug or a manual transmission drain plug, you may have seen the fine particles stuck to the magnet.  While these may be extreme examples since the metal to metal components are under a high degree of stress and the oil is not filtered, it does show the effectiveness of a magnet to capture metal particles suspended in oil.  So from there, you might be able to see how a magnet can capture tiny steel particles floating in your oil.  Probably one of the most effective places to put a magnet would be at the lowest point in the engine, the drain plug.  An OEM replacement magnetic drain can be purchased online from a number of manufacturers.  Don’t attempt to modify a stock non-magnetic drain plug by attaching a magnet to it.  The last thing you want is a magnet breaking free and coming in contact with the moving parts in the lower end of your engine.
But a magnetic oil drain plug is not the point of this article.  Here we want to explore the idea of using one of the most commonly acquired SUPER strong magnets you can find and attaching it to the housing of a steel oil filter.  Why the oil filter?  Because you are going to capture steel particles on the inside of the housing, then at your oil change, you are going to discard the filter (in an EPA approved method of course).
So where do we get the SUPER strong magnet?  Out of an old computer’s hard drive.  Inside every hard drive is an extremely strong, nickel plated ceramic magnet. Sometimes there are two in an old hard drive.  Most of us have a computer and if we have a computer, chances are we have an old computer somewhere taking up space.  If not , we know someone who does.  You’re a resourceful bunch so it probably won’t be too hard to come up with an old hard drive.
hard-drive-1-150x150 hard-drive-4-150x150
Next we are going to have fun and dissect the hard drive.  No need to be gentle of you don’t have the right driver set, but it does make the job easier if you can open the drive without much effort.  Don’t try smashing it on the ground.  That won’t work. Hard drives are quite durable.  To remove the magnets, you will remove an aluminium plate by removing typically seven T6 Torx screws.



When you extract magnets from hard drives, sometimes they are large, others are smaller. But all are STRONG .
They are however fragile with nickel plating and will break easily, so use care when removing them from the hard-drive-magnetsplates.  Keep them away from credit cards or other digital hardware,  the strong field will damage magnetic strips or other digital media.
To attach to an oil filter, you want to do more than magnetically attach the magnet to the filter.  During the life of the filter you don’t want the magnet to slip or move or fall off.  Wrap electrical tape around the magnets to hold them to the filter.  Be sure to attach the magnets to the sides of the filter somewhere around the middle, not near the bottom or top.  Then at the next oil change, just remove your filter as usual and then cut the tape to remove the magnets for re-use.
Does this really benefit the engine I hear you ask, well yes it does. The more magnets on the filter the better.  I have seen used filters that had magnets attached to them for the duration of that batch of oil and when they were opened up, there were ferrous metal particles attached to the wall of the filter.  The magnets did their job and removed these particles from the oil flow.  Now the argument is out there that the filter media would have trapped the ferrous particles.  I argue that if these particles were smaller than 10 microns, they will likely pass through the filter and act as an abrasive in your engine!  So remove what you can!  It may not be a huge benefit but it can’t hurt anything, only help.  Remember though, nothing beats regular oil changes.


Written by Thomas Sawyer

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