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Oil change, do you know if your car service shop drains or extracts oil from the top ?

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44 minutes ago, transam said:

 

Cr_p that maybe floating around in your engine may not all go through the filter, in fact any minute bit of metal may stuff the oil pump before it gets to the filter. The mag plug could save a lot of hassle if it catches a bit of metal. So metal caught does not always me a pending catastrophe, If you have a performance fun ride the mag drain plug can be a good tool to see what's going on, I also used a Oberg screen filter on my fun ride so I knew exactly what was going on in a few minutes that was not magnetic....

Yeah it could be a useful tool especially for a special car or maybe a custom engine that sees high RPMs frequently and you change your oil yourself. But for the typical driver and average car not necessary.

 

If you did see bit more than the usual amount of material on the plug what can you do? Take the car to the shop and have them tear the engine down because there might be a problem? Like I said I'd rather be blissfully unaware instead of worrying over something that probably is not even a real problem.

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Draining of course at the ramp at Mazda and I witness it.

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On 1/16/2020 at 6:15 PM, Surelynot said:

Drain surely. All the gunk you need to remove is in the sump plus the oil plug is magnetic and picks up shards of metal.

If you have gunk in the sump you have more problems than you can fix with an oil drain. Additionally, draining oil from the bottom also means the tech had to wait at least 30 minutes to make sure the dirt really makes it down and out of the engine.

Changing motor oil by sucking oil out of the top of the engine will yield just as much dirt removal - to keep dirt in suspension, run the engine until the oil is warm (not hot) then extract the oil immediately, it works like a charm. In most modern engines, the oil filter is also mounted on the top, making a LOF change quick, simple and clean. Conversely, if the filter is mounted at the bottom the old fashioned way, and the car has to be lifted anyway, draining the oil is probably the designed way - just don't forget to change the crush washer to makes sure the drain plug doesn't leak.

 

 

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those extractors don't drain all the oil. it will show on the dip stick that it has but the dip stick doesn't go all the way to the bottom of the sump it is only a gauge to show when full.

 

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Ive sat there and watched them lift the car on a hoist and drain via the sump plug.

 

It annoys me they don't put a new washer/seal on the sump plug.

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You could take this to another level - Buy an oil filter splitter - Then after the oil change - Split the filter open and try to make sence of the various particles that you find inside .. Different metal particles will come from different parts of the engine ... Can give you an indication of what part is deterioration inside the engine ... Often done on aircraft engines (light aircraft). 🙂

 

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4 minutes ago, rvaviator said:

You could take this to another level - Buy an oil filter splitter - Then after the oil change - Split the filter open and try to make sence of the various particles that you find inside .. Different metal particles will come from different parts of the engine ... Can give you an indication of what part is deterioration inside the engine ... Often done on aircraft engines (light aircraft). 🙂

 

Far easier to grab a sample and send it off for analysis.

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My Isuzu dealer drains the oil and flushes which is the only way to change oil on a diesel. When I used to do it myself I always removed the sump to clean it and the magnetic plug always collected a lot of shards.

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1 minute ago, chilly07 said:

My Isuzu dealer drains the oil and flushes which is the only way to change oil on a diesel. When I used to do it myself I always removed the sump to clean it and the magnetic plug always collected a lot of shards.

Removing the sump is abit extreme, did you have to drop the crossmember to do it ?

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On 1/18/2020 at 12:10 PM, CharlieH said:

Take my cars to main dealers for many many years, and even here in Thailand its on the lift, up, and drain from the bottom.

How do I know, because they have a huge window where you can sit and observe everything that is done.

 

The other point, if you suck it out, you may (in many cases) have to raise the car to extract the oil filter, so if it has to go up anyway, you might as well drain it.😉

So, more efficient and less time consuming to raise, drain, and change the filter.(IMHO) Also a good chance to inspect the underside of the vehicle etc.

 

You must drive a cheap old car.

All Benz dealers extract oil when it's possible and oil filter is on top.

 

 

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