Draining engine oil

**Zilli** · 12-05-2008 04:10 PM

ooooohhhhhhhhh ok, well OP made it sound like the guy was syphoning the oil out through the filler!!!!

Dip stick is possible, but yeh you wont get as much out as you will by draining the sump...

**aaronng** · 12-05-2008 04:17 PM

Originally Posted by Zilli

ooooohhhhhhhhh ok, well OP made it sound like the guy was syphoning the oil out through the filler!!!!

Dip stick is possible, but yeh you wont get as much out as you will by draining the sump...

Yeah, makes me wonder why since he is already putting the car on the hoist to remove the oil filter. Might as well drain the oil through the sump plug.

**VTECMACHINE** · 12-05-2008 04:18 PM

Weeeeiirrrddddd... I wanna know what this garage is now!

**VTECMACHINE** · 12-05-2008 04:29 PM

Originally Posted by claymore

They do it by suction to save mechanic TIME and time is money in those places and it saves a bunch of time not having to take out the drain bolt and waiting for it to drain. So they can do more oil changes in a day and make more money.

Thanks for that lesson in Business studies!

But wouldn't it take longer to syphon it out.. seriously? when you think about pressure etc, would it like build up?

what I mean is, like when you don't take off the oil cap when draining from the sump plug, it takes longer than when you do take off the oil cap. Did that make any sense.. just a thought I had.

**aaronng** · 12-05-2008 04:34 PM

Originally Posted by claymore

They do it by suction to save mechanic TIME and time is money in those places and it saves a bunch of time not having to take out the drain bolt and waiting for it to drain. So they can do more oil changes in a day and make more money.

I thought that the flow rate out of the sump drain hole was quicker than through a measly tube that fits in the dip stick hole. The only way I can see this benefitting the mech is that he removes only part of the oil (say 3L), so that it takes less time (doesn't have to wait for every last drop to come out before putting the bolt back on), uses only 3L of his oil and saves him 20 cents on that sump plug washer.

**insanesam** · 12-05-2008 04:42 PM

Originally Posted by aaronng

^^ Yup, you can if you do it through the dipstick tube in a B/H/D series. However, on newer engines, the dipstick tube is actually along the oil galleries and it is not possible to insert a tube of reasonable size to the sump.

Yeah i think it was dipstick tube, instead of the other one where u pour in oil.

**EKVTIR-T** · 12-05-2008 04:45 PM

But he lifted the car anyway to swap the filter...
Slide over the oilcatcher stand,undo bolt,drain while doing the filter.Simple
This suction idea sounds pointless honestly.

**Integra89** · 12-05-2008 05:10 PM

Originally Posted by civ04

yo fellas,there is a device that you put down your dipsick tube and it will sifen the oil out of the engine.ive used one at one of the mechanical shops i worked at.i dont like em.if you dont put tube all the way in to the bottom of the sump,then it wont such out all the oil from the bottom.i didnt think there was any real bennefit to it,so i used to do oil changes the conventional way.
hope this helps.

we dos on truckes. when we need a sample without draining oil, i no the thing your talking about. but to do and oil change this way is very umm...diffrent

**Zilli** · 12-05-2008 05:33 PM

Originally Posted by aaronng

I thought that the flow rate out of the sump drain hole was quicker than through a measly tube that fits in the dip stick hole. The only way I can see this benefitting the mech is that he removes only part of the oil (say 3L), so that it takes less time (doesn't have to wait for every last drop to come out before putting the bolt back on), uses only 3L of his oil and saves him 20 cents on that sump plug washer.

i would back this opinion...

if you look at it from a process efficiency perspective (where volume of work is your coefficient for increasing bottom line profit) if you had a brain you would do it all whilst your under the car and stop doubling up your time working from the top and then the bottom.... only a dumb shit would do it the other way if they were thinking about time spent and profit per job...

**jzdhgkd** · 12-05-2008 06:40 PM

Wow my mechanic sucked the oil through the oil filler cap last time as well! And then proceeded to hoist the car, change the oil filter and rotate the wheels... wonder if it's the same guy lol.
Might be time to practice changing my own oil :P