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rech

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

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hello,

 

I was old fashioned and was thinking that draining oil from the bottom was always better.

After reading about it, it seems that there is no difference and that it is a legend. I also guess that most people don't know that their car service place extracts ? vacuums oil and does not drain. It is done this way since dozens years.

 

Has anybody bought a pneumatic or electric oil extractor in Thailand ? And are you changing oil yourself ?

https://www.lazada.co.th/products/9l-vacuum-oil-fluid-extractor-engine-motorbike-car-oil-suction-pump-transfer-i221815206-s338506268.html

PetHot 7L Manual Vacuum Oil Pump Fluid Extractor Vacuum Oil Transfer of Car Diesel Fuel Litre Tank

 

What do you think ?

thank you.

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Troll post reported and removed.

 

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7 hours ago, transam said:

Should always drain from the bottom to remove crud and metal, plus the drain plug can be a good warning sign tool....

 

 

After reading a lot, I am sure that it is the old fashioned way proven useless on most new cars.

 

 

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Just now, rech said:

 

 

After reading a lot, I am sure that it is the old fashioned way proven useless on most new cars.

 

 

Really, why is that..?

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On 1/16/2020 at 5:13 PM, Coremouse said:

I think of course shops would drain from bottom? Can't imagine any shop worker would waste precious man-hour to slowly extract oil from a dipstick hole... Plus most japanese cars in Thailand have to be jacked up change oil filter anyway, and plus certain beemers start trending to eliminate engine dipstick... 

 

The extractor could be very handy deal with excessive oil

 

I change oil myself, and I alway use a little bit fresh oil to "flush" the sump, can't do that with extractor

 

 

Sorry but it's clearly faster and easier for any mechanic to do it through dipstick hole....

 

 

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If I took my car for a oil change I would feel 'better' if they sucked it up.  If not I would worry that they did not tighten the drain plug properly ...  If I was doing it myself I would drain - not waste money on a 'gadget' I would not need .. (I have enough of them already) . 😉 .

 

 

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49 minutes ago, KeeTua said:

I've never owned a car that's had a magnetic drain plug for the engine. It would be unnecessary since your oil filter will remove most particles as the engine oil circulates.

 

If there is gunk in the oil pan that is too heavy to mix with the oil when then engine is running then it is unlikely to flow out the drain hole during an oil change. One reason you're supposed to bring your engine up to running temperature maybe 10 minutes before changing the oil is so any sediment that settled out while parked will mix with the oil prior to draining. If you only drain your engine oil when the engine is cold then over time you will likely build up sludge faster than if you drain from a warmed up engine.

 

On the other hand manual gear boxes, transfer cases and differentials  usually have magnetic drain plugs maybe for a couple of reasons. No oil filters and more likely to have chunks of metal from gears grinding together.

 

 

Wrong

 

49 minutes ago, KeeTua said:

I've never owned a car that's had a magnetic drain plug for the engine. It would be unnecessary since your oil filter will remove most particles as the engine oil circulates.

 

If there is gunk in the oil pan that is too heavy to mix with the oil when then engine is running then it is unlikely to flow out the drain hole during an oil change. One reason you're supposed to bring your engine up to running temperature maybe 10 minutes before changing the oil is so any sediment that settled out while parked will mix with the oil prior to draining. If you only drain your engine oil when the engine is cold then over time you will likely build up sludge faster than if you drain from a warmed up engine.

 

On the other hand manual gear boxes, transfer cases and differentials  usually have magnetic drain plugs maybe for a couple of reasons. No oil filters and more likely to have chunks of metal from gears grinding together.

 

 

So why do they actually make drain plugs with a magnet...?

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54 minutes ago, transam said:

Wrong

So why do they actually make drain plugs with a magnet...?

Google it. You'll find many discussions about it. The magnetic engine oil drain plugs tend to be aftermarket. Probably your basic weekend mechanic who doesn't really know the difference between a camshaft and a crankshaft buy into the idea that it makes sense to have a magnet.

 

About the only argument I've seen in support of the magnet that makes a little bit of sense is to use it as an early indication that something nasty might be taking place inside the engine if you see chunks of metal on the plug. But that argument doesn't work for me. I prefer to remain blissfully unaware until my ears or my gut tell me there's something wrong.

 

And if someone else is doing the oil change, a Thai shop for example, do you really believe they will take the time to show you your oil plug if they did see extra material on it?

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