Magnet on sump

[dirky dirk]

Does anyone do this?
Have you found it’s been a good idea and caught a few bits of floatsam and jetsom?

[mickyh7]

Most debris will be Aluminium or Gasket bits.
Not very attractive to a Magnet!

[E-bmw]

You can buy magnetic sump plugs for just a few £ but I would not recommend putting a magnet on the sump.

[Evoluzione]

How are you going to see what it caught? The filter does the job. If you need to do more then fit a mag drain plug or a mag filter.

[VanDiesel99]

I can't remember ever finding metal debris in my engine oil, even though my last car had nearly 300k on it when I sold it; so a bit pointless. If you do however have such debris, maybe a new car would be in order.

[mickyh7]

Most 'Debris' in the sump is from the manufacturing process.
Mainly Casting Sand and a little Aluminium swarf.
Removed during the first oil and filter change.
Steel debris is found in gearboxes, diffs etc.
Just don't worry about it.

[E-bmw]

Evoluzione said:

How are you going to see what it caught? The filter does the job. If you need to do more then fit a mag drain plug or a mag filter.

The filter cleans the oil on the way round the engine, anything then washed out as the oil passes through ends up back in the sump. Obviously any magnet will only catch ferrous particles, of which there should be very minimal amounts if all is well.

[paintman]

If you have a magnetic sump plug in the engine you may well find a paste like substance stuck to it.
As the various steel bits inside wear away, the worn away stuff has to go somewhere. Usually the filter will pick most of it up.

Gearbox & diff ones tend to look more spectacular due to the lack of filtration.

If you find big chunks of metal then you have a problem!

[Evoluzione]

E-bmw said:

Evoluzione said:

How are you going to see what it caught? The filter does the job. If you need to do more then fit a mag drain plug or a mag filter.

The filter cleans the oil on the way round the engine, anything then washed out as the oil passes through ends up back in the sump. Obviously any magnet will only catch ferrous particles, of which there should be very minimal amounts if all is well.

Thanks for the 'How an engine works' lesson.

[Smint]

Best way to drain will always be removing the sump bung, done with a hot engine anything in the sump will flow out with the hot oil.

Used to be magnetic sump plugs on BL transverse engines, these always collected steel particles but the gearbox shared the engine oil so to be expected, don't think i've ever come across a magnetic engine sump bung on anything else i can recall.