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E36 General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.

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Old 01-10-2007, 09:30 AM   #1
kvadgama

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Question Magnet attached to oil pan ????

Someone suggested that I should attach a magnet to the bottom of my oil pan . When the car rests overnight and all oil is in the pan, metal particles will get attracted to the magnet. And when you drain the oil, all those metal particles will get drained.
Is there any truth in this?

Appreciate any of your thoughts.

Chow!!
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Old 01-10-2007, 10:37 AM   #2
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It would have to be one helluva a magnet. Alot of particles would be aluminum also (which isn't magnetic) - just change your oil and filter at 3k intervals is your best bet. Note: Auto trans has a magnet in the pan that needs cleaning when trans fluid is changed.
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Old 01-10-2007, 11:32 AM   #3
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Yeah the magnet wouldn't attract a lot of the particles in the oil unless it was some kind of huge super magnet. Then you'd have bigger problems than the particles in your oil.
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Old 01-10-2007, 12:37 PM   #4
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Actually fellas, it's done all the time, and it's particularly effective with magnesium or aluminum oil pans. The magnet is attached outside the pan (non-magnetically), so any ferric-metallic particles get stuck to the inside wall. When you change your oil, remove the magnet before draining, and those particles will be released and you'll get it flowing out as you drain. It won't catch a lot, as c1apton cited that a lot of metal will not be ferrous, but it does work. My brother does it, but personally, I don't bother.
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Old 01-11-2007, 08:30 AM   #5
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they also makes those drain plugs that are magnetic too. if i ever changed my plug, i would get one, just because it wouldnt hurt, but like everyone else said, i dont have any restless nights because of it.
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Old 01-12-2007, 02:01 PM   #6
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i've never heard of a magnet in the oil pan, and like c1apton said there's one in the trans fluid sump in an auto trans, i'm guessing for the same purpose?
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Old 01-12-2007, 03:26 PM   #7
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there is a group buy on bimmer forums for magnetic drain plugs. They seem to work well judging by the rate they are selling. I am hoping it doesn't just provide a false sense of security though.
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Old 01-12-2007, 08:41 PM   #8
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^^^ when i once younger i helped change the oil in my grandfathers truck. i ended up stripping the plug (luckily the pan was fine). we bought a plug with a magnetic tip, and when i pulled it out next time it had a bunch of crap stuck to it.

so it does work, but. . .
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Old 01-12-2007, 09:01 PM   #9
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Quote:
Originally Posted by 94bmw325i
there is a group buy on bimmer forums for magnetic drain plugs. They seem to work well judging by the rate they are selling. I am hoping it doesn't just provide a false sense of security though.
A group buy? they only cost like $3.00 at about any parts store. Must be the ///M power ones that they need to get a group buy going
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Old 01-12-2007, 09:15 PM   #10
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Heard of that before, same concept as using a magnetic oil drain plug, I have one of those on my car...
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Old 01-14-2007, 04:31 PM   #11
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Quote:
Originally Posted by c1apton
A group buy? they only cost like $3.00 at about any parts store. Must be the ///M power ones that they need to get a group buy going
idk man I guess so...
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