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#4585323 - 11/26/17 09:22 AM Draining oil hot or cold questions?
ZZman Offline


Registered: 03/17/08
Posts: 5794
Loc: Michigan
1. Do you normally drain your oil hot, warm or cold?

2. If oil thins when cold and thickens when hot, why does hot oil drain quicker?

* I drain my oil hot.


Edited by ZZman (11/26/17 09:27 AM)
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#4585326 - 11/26/17 09:25 AM Re: Draining oil hot or cold questions? [Re: ZZman]
Bottom_Feeder Online   content


Registered: 12/07/08
Posts: 3013
Loc: Occupied Virginia
3. I drain it warm.

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#4585329 - 11/26/17 09:28 AM Re: Draining oil hot or cold questions? [Re: ZZman]
knerml Offline


Registered: 04/05/05
Posts: 481
Loc: NE Ohio
You should drain oil right after turning off a warmed up engine, because:
1. Contaminates are still in suspension, and have not had time to settle into the pan or separate out
2. Less initial start-up wear, after the change

Cold oil may drain faster because it is all in the pan. Warm oil needs to drain down off the top of the engine and galleries.



Edited by knerml (11/26/17 09:29 AM)
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#4585331 - 11/26/17 09:29 AM Re: Draining oil hot or cold questions? [Re: Bottom_Feeder]
JohnnyJohnson Offline


Registered: 10/22/09
Posts: 2774
Loc: Wet side WA
Originally Posted By: Bottom_Feeder
3. I drain it warm.


thumbsup
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#4585332 - 11/26/17 09:30 AM Re: Draining oil hot or cold questions? [Re: ZZman]
gathermewool Offline


Registered: 01/09/09
Posts: 6003
Originally Posted By: ZZman
If oil thins when cold and thickens when hot, why does hot oil drain quicker?


Oil thickens when cold, just like the vast majority of other liquids. It drains better when hot, because it's thinner. Having driven the vehicle recently also mixes the oil, so if anything had settled out, it will likely be picked up and carried out the drain hole with the rest of the oil.

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#4585333 - 11/26/17 09:31 AM Re: Draining oil hot or cold questions? [Re: ZZman]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35897
Loc: Great Lakes
Originally Posted By: ZZman
1. Do you normally drain your oil hot, warm or cold?

I extract it when warm/hot.

Quote:
2. If oil thins when cold and thickens when hot, why does hot oil drain quicker?

Oil does not thin when cold. Oil thickens when cold.
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#4585344 - 11/26/17 09:39 AM Re: Draining oil hot or cold questions? [Re: ZZman]
car51 Offline


Registered: 03/12/15
Posts: 10267
Loc: Southwest PA
Yep, I extract my oil when it’s warm after a nice drive. Oil extractor is way to go smile
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#4585346 - 11/26/17 09:39 AM Re: Draining oil hot or cold questions? [Re: ZZman]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
Originally Posted By: ZZman
2. If oil thins when cold and thickens when hot, why does hot oil drain quicker?


Lol is that a trick question?

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#4585351 - 11/26/17 09:44 AM Re: Draining oil hot or cold questions? [Re: ZZman]
eljefino Offline


Registered: 06/15/03
Posts: 32671
Loc: ME
Originally Posted By: ZZman

2. If oil thins when cold and thickens when hot, why does hot oil drain quicker?


A multigrade oil fights its normal tendency to thin when hot, but isn't completely successful, and still thins out.

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#4585353 - 11/26/17 09:44 AM Re: Draining oil hot or cold questions? [Re: ZZman]
thorromig Offline


Registered: 03/22/12
Posts: 804
Loc: BerksCounty/Pa.
When hot with oil/particulates in suspension.
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#4585363 - 11/26/17 09:56 AM Re: Draining oil hot or cold questions? [Re: ZZman]
3800Series Offline


Registered: 08/02/14
Posts: 1452
Loc: Gulf Coast, MS
What ever it is at the time. If I've been driving it recently it will be warm/hot if not cold. I'm not going to go out of my way to drain a slightly warmer oil.

Vehicle hasn't imploded yet.

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#4585369 - 11/26/17 10:08 AM Re: Draining oil hot or cold questions? [Re: ZZman]
Chris142 Offline


Registered: 06/05/03
Posts: 16844
Loc: Deplorable in apple valley, ca
Depends on the circumstances. If I get to work early I will drain it hot. If the truck is due and I dont have time I will do it cold in the parking lot before I go home.
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#4585382 - 11/26/17 10:15 AM Re: Draining oil hot or cold questions? [Re: ZZman]
Alex_V Offline


Registered: 04/10/16
Posts: 1156
Loc: Campbellsville, KY
Preferably within 10 minutes of shut-down. I'll drain one cold rather than luke-warm. The longer it can drain the better.
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#4585387 - 11/26/17 10:17 AM Re: Draining oil hot or cold questions? [Re: knerml]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
Originally Posted By: knerml
You should drain oil right after turning off a warmed up engine, because:
1. Contaminates are still in suspension, and have not had time to settle into the pan or separate out


This actually takes a long time to happen.

I drain mine after a highway trip, and about 30-40 minutes cool down.
I don't wait for it to stop dripping - plug in, new oil in, and running again before it ever cools down completely.
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#4585389 - 11/26/17 10:18 AM Re: Draining oil hot or cold questions? [Re: ZZman]
4WD Offline


Registered: 09/21/10
Posts: 6437
Loc: Texas
Position ramps, start motor, drive on ramps, turn off.
Gather wrenches, funnel, oil, shop towels, hand cleaner …
Position oil filter/oil for photo and snap odometer pic too …

Now at scientifically proven drain temp ~ go for it …

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