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Samarium Cobalt magnets for oil filter? #4543939
10/15/17 09:55 AM
10/15/17 09:55 AM
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
StevieC Offline OP
StevieC  Offline OP
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
In the past I had used a Filter Mag on the side of my oil filter and when I cut open the filters it did catch a lot of really fine metal residue. Over time the filter mag kept loosing it's strength until eventually it wouldn't hold to the filter any longer. They use Neodymium magnets which aren't the greatest for keeping their magnetic powers under prolonged heat conditions.

I found some Samarium Cobalt magnets online at a decent price and these are supposed to be great for really high heat conditions so I was wondering if anyone else used these with good results over the long term?


'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4543948
10/15/17 10:09 AM
10/15/17 10:09 AM
Joined: Mar 2015
Posts: 11,902
In the shop
53' Stude Offline
53' Stude  Offline
Joined: Mar 2015
Posts: 11,902
In the shop
I put 6 neodymium magnets on my Bosch D+ filter so after 2 5k oci's we shall see what they did


09' Camry LE, 141,020 miles

PP 5w30 and TG 4967
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4543952
10/15/17 10:15 AM
10/15/17 10:15 AM
Joined: Mar 2010
Posts: 1,348
Michigan
BobsArmory Offline
BobsArmory  Offline
Joined: Mar 2010
Posts: 1,348
Michigan
Would the FilterMag company warranty the magnets? Could be worth a try.


Keeping the forces of evil at bay
2016 Chevy Malibu LT 1.5 Liter Turbo
2017 Chevy Equinox LT 2.4 Liter
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4543959
10/15/17 10:24 AM
10/15/17 10:24 AM
Joined: Jan 2009
Posts: 6,527
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,527
New England
Interesting. How long were the magnets in service before they started noticeably losing strength, and how long before it because nearly useless?

I always poo poo'd on those who used filter mags, but have recently changed my mind. I purchased a dozen neodymium bars, but only installed a few, to check the impact of heat after a few OCI's. the rest are holding tools up on my bench or on the fridge (though they're kind of a pain for the fridge, since they're so strong...)

I'll have to look into the Samarium Cobalt magnets - thanks for sharing!


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4543971
10/15/17 10:40 AM
10/15/17 10:40 AM
Joined: Mar 2010
Posts: 1,348
Michigan
BobsArmory Offline
BobsArmory  Offline
Joined: Mar 2010
Posts: 1,348
Michigan
I have a Filtermag that was bought in 2010 and it's still working fine. Hope I didn't just Jinx myself. ;-)


Keeping the forces of evil at bay
2016 Chevy Malibu LT 1.5 Liter Turbo
2017 Chevy Equinox LT 2.4 Liter
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4543973
10/15/17 10:45 AM
10/15/17 10:45 AM
Joined: May 2010
Posts: 9,493
out there
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,493
out there
[quote=StevieC
I found some Samarium Cobalt magnets online at a decent price and these are supposed to be great for really high heat conditions so I was wondering if anyone else used these with good results over the long term?

[/quote]

I used samarium cobalt magnets to make my own magnetic drain bolts. I have one in my sons elantra, one to go in my elantra at the next oci.
No long term results yet.

https://bobistheoilguy.com/forums/ubbthreads.php/topics/4465589

Bottom of page 2


Last edited by spasm3; 10/15/17 10:47 AM.

13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
Re: Samarium Cobalt magnets for oil filter? [Re: gathermewool] #4544003
10/15/17 11:19 AM
10/15/17 11:19 AM
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
StevieC Offline OP
StevieC  Offline OP
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
Originally Posted By: gathermewool
Interesting. How long were the magnets in service before they started noticeably losing strength, and how long before it because nearly useless?

I always poo poo'd on those who used filter mags, but have recently changed my mind. I purchased a dozen neodymium bars, but only installed a few, to check the impact of heat after a few OCI's. the rest are holding tools up on my bench or on the fridge (though they're kind of a pain for the fridge, since they're so strong...)

I'll have to look into the Samarium Cobalt magnets - thanks for sharing!


At year 5 is when it was noticeable and year 8 is when it couldn't hold on any longer. About 300K miles (500,000km's) The Santa Fe died shortly there after from a broken Camshaft.

Last edited by StevieC; 10/15/17 11:21 AM.

'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: Samarium Cobalt magnets for oil filter? [Re: spasm3] #4544006
10/15/17 11:20 AM
10/15/17 11:20 AM
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
StevieC Offline OP
StevieC  Offline OP
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
Originally Posted By: spasm3


I used samarium cobalt magnets to make my own magnetic drain bolts. I have one in my sons elantra, one to go in my elantra at the next oci.
No long term results yet.

https://bobistheoilguy.com/forums/ubbthreads.php/topics/4465589

Bottom of page 2



Yeah that is why I thought it would be great to put them on my oil filter. It was your post that I realized there was a difference.


'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4544110
10/15/17 01:07 PM
10/15/17 01:07 PM
Joined: Jul 2009
Posts: 750
texas
danez_yoda Offline
danez_yoda  Offline
Joined: Jul 2009
Posts: 750
texas
Originally Posted By: StevieC
Originally Posted By: gathermewool
Interesting. How long were the magnets in service before they started noticeably losing strength, and how long before it because nearly useless?

I always poo poo'd on those who used filter mags, but have recently changed my mind. I purchased a dozen neodymium bars, but only installed a few, to check the impact of heat after a few OCI's. the rest are holding tools up on my bench or on the fridge (though they're kind of a pain for the fridge, since they're so strong...)

I'll have to look into the Samarium Cobalt magnets - thanks for sharing!


At year 5 is when it was noticeable and year 8 is when it couldn't hold on any longer. About 300K miles (500,000km's) The Santa Fe died shortly there after from a broken Camshaft.


Only 300k miles. Id be POd smile.

We have some high expectations of cars nowadays.

Last edited by danez_yoda; 10/15/17 01:07 PM.
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4544112
10/15/17 01:09 PM
10/15/17 01:09 PM
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
StevieC Offline OP
StevieC  Offline OP
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
We'll see how long the SC type magnets last because they are rated for high heat like ovens.


'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4544125
10/15/17 01:18 PM
10/15/17 01:18 PM
Joined: May 2016
Posts: 720
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 720
Canada


I've used individual magnets and a PAIR of FilterMags for 4 yrs or so, no issues.

But when you select individual bar magnets, be sure they're about 3/16" wide max, otherwise
the won't stick fast to the radius of the filter housing and may 'rock' a little, this means
some or most of the magnetic field is not cleanly coupled to the filter housing thru to
the inside. It seems counter-intuitive, but long narrow magnets generate a strong narrow
field that picks up well inside a filter!

ALL magnets have a specified max operating temp spec (& currie point) so if you chose low temp neodymium
OR samarium cobalt you may not be happy after a while. Realistically you may lose 20% or so.

(Low temp magnets have a currie point of about 350F where they die completely. In a engine oil application
you won't hit that on a family hauler)

Min operating temp for most is 175F, then 200- 250F and up. The kicker is if you overdo it and pick the
highest possible, they'll be weaker out of the box as a trade off for really hi operating temps.

For filter applications you wanna be 200F to 250F, not more then that.

TIP: If you order magnets, be sure they're magnetized thru the sides, not the ends. In the old days
kids magnets were only strong at the ends. For filter use you want the N / S poles to be on the long sides
of the magnets you chose ("magnetize thru it's thickness). Manufactures may offer magnets with different
"magnetic orientations".

Take a look at some the pics in this PDF:

FILTERMAG vs HOMEBREW
https://app.box.com/s/uxvu8dmscf5wcgftutdm0ejqwgn86tw7

A good place to order magnets is KJ Magnetics on the web.... or is 'JK'? close enough! gotta check again..

Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4544138
10/15/17 01:33 PM
10/15/17 01:33 PM
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
StevieC Offline OP
StevieC  Offline OP
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
Thanks! thumbsup


'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: Samarium Cobalt magnets for oil filter? [Re: i_hate_autofraud] #4544245
10/15/17 04:04 PM
10/15/17 04:04 PM
Joined: May 2010
Posts: 9,493
out there
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,493
out there
Originally Posted By: i_hate_autofraud


ALL magnets have a specified max operating temp spec (& currie point) so if you chose low temp neodymium
OR samarium cobalt you may not be happy after a while. Realistically you may lose 20% or so.

(Low temp magnets have a currie point of about 350F where they die completely. In a engine oil application
you won't hit that on a family hauler)

Min operating temp for most is 175F, then 200- 250F and up. The kicker is if you overdo it and pick the
highest possible, they'll be weaker out of the box as a trade off for really hi operating temps.




Samarium cobalt magnets are not low temp, thats why i chose them. They lose strengt at 300c.




Last edited by spasm3; 10/15/17 04:13 PM.

13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4544258
10/15/17 04:19 PM
10/15/17 04:19 PM
Joined: May 2010
Posts: 9,493
out there
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,493
out there
These are what I used. Max operating temp 300f. My oil won't get that hot.

https://www.apexmagnets.com/1-4-x-1-cylinders-smco

Last edited by spasm3; 10/15/17 04:20 PM.

13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
Re: Samarium Cobalt magnets for oil filter? [Re: StevieC] #4544327
10/15/17 05:34 PM
10/15/17 05:34 PM
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
StevieC Offline OP
StevieC  Offline OP
Joined: Aug 2008
Posts: 21,330
ON, Canada eh?
Sapsm3, thanks... smile

Yeah 300 Celsius is 572 degrees Fahrenheit, way lower than my oil filter will see. thumbsup




Last edited by StevieC; 10/15/17 05:35 PM.

'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF

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