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Magnetic Drain Plug for Transmission: useless, or a good idea?

Old 10-31-2008, 10:28 PM
  #21  
davidv
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If you have metal shavings in the oil its too late for a magnet.
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Old 11-01-2008, 06:45 AM
  #22  
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Originally Posted by davidv View Post
If you have metal shavings in the oil its too late for a magnet.
lol.

Well I can't speak about 350Z's. But I never had problems with my camaro nor my RSX.
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Old 01-23-2009, 05:07 AM
  #23  
j.arnaldo
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Just get a high quality oil filter (Purolator's PUREONE was rated THE best on recent tests), & forgo the magnetic thingy!
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Old 01-29-2009, 08:55 PM
  #24  
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The magnetic oil drain plug works. I have small metal "buildup" each time I change my oil and I know I don't want that crude running through my engine...i would say it is a long term investment..
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Old 11-07-2009, 08:07 PM
  #25  
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Sorry to bump an old post, but did anyone get an answers on this?

Leaning toward a new Z and I figured for a few buck why not throw these magnetic plugs on during break-in.

Thanks.
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Old 11-09-2009, 08:59 AM
  #26  
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It's easy to turn your plain plugs into magnetic ones.

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Old 06-10-2013, 03:03 PM
  #27  
izmir41500
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Was the size of the transmission and differential drain plugs ever disclosed? I still can't find them.
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Old 04-24-2015, 06:26 PM
  #28  
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Originally Posted by izmir41500 View Post
Was the size of the transmission and differential drain plugs ever disclosed? I still can't find them.
I'm going to bump this extremely old thread to provide some information.

The only plug you want to use is a Dimple plug. Anything else is counter-productive. There is one company that comes close to the quality of a Dimple plug, although the magnet isn't the same. Its Gold Plug. Half the price, but still quite powerful. The part numbers are:

Oil: AP-03
Transmission: AP-05
$18.99 per



The reason any other magnetic drain plug other than the mentioned is worthless is because heat reduces the magnets efficiency. If you're using a cheap neodymium magnet, the magnet can be permanently damaged at normal oil temps. In some rare cases the slob of ferrous particles stuck to the magnet can detatch as a group and make their journey past your oil pump gears. There was a stanford research paper about magnets, and it was pretty scary to think I've been running a standard, skinny cylinder neodymium magnet for my drain plug [Shape of the magnet plays a huge role in heat resistance]. Sure, removal of the plug showed ferrous particles, but only because after the temps cooled, the magent was able to regain some of its strength to attract some of them back.

In summary, if you have a standard magnetic drain plug, remove it, or get something that can withstand temps above 300*f to keep the ferrous particles attached.

Update: Both drain plugs work perfectly. The Oil drain plug retains it's strength even while hot. It was actually rather difficult to install it because it wanted to stick to the pan. Forget about removing residual shavings, the magnet is too strong.

The Transmission drain plug teamed with Running Amsoil MTG (with an additional 0.5 qts) has cured my griding completely. Had troubles getting it into any gear and would grind nearly every time. Was a last effort before replacing the trans. No more notchiness or grinding. You will need to install one or two additional washers because the depth of the transmission plug will contact the internals. Otherwise, both are well worth the money.

Last edited by Bigsyke; 07-07-2015 at 09:53 AM.
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Old 04-24-2015, 08:56 PM
  #29  
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Wow just bought a greddy oil plug today. Guess ill return it for a gold plug as its just a neodymium magnet
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Old 05-31-2015, 05:31 AM
  #30  
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size is M18 x 1.5. and the threaded section is 10mm
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