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Draining oil hot or cold questions? #4585323
11/26/17 10:22 AM
11/26/17 10:22 AM
Joined: Mar 2008
Posts: 6,402
Michigan
ZZman Offline OP
ZZman  Offline OP

Joined: Mar 2008
Posts: 6,402
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.

Last edited by ZZman; 11/26/17 10:27 AM.

2003 Mercury Grand Marquis. PP HM 5w-30 and Fram TG
2008 Sebring Hardtop convertible. PP HM 5w-30 and Fram Ultra
2006 Kawasaki Vulcan 900 LT. Motul 7100 10w-40 and K&N
Re: Draining oil hot or cold questions? [Re: ZZman] #4585326
11/26/17 10:25 AM
11/26/17 10:25 AM
Joined: Dec 2008
Posts: 3,177
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline

Joined: Dec 2008
Posts: 3,177
Occupied Virginia
3. I drain it warm.

Re: Draining oil hot or cold questions? [Re: ZZman] #4585329
11/26/17 10:28 AM
11/26/17 10:28 AM
Joined: Apr 2005
Posts: 683
NE Ohio
knerml Offline
knerml  Offline

Joined: Apr 2005
Posts: 683
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.


Last edited by knerml; 11/26/17 10:29 AM.

2015 Hyundai Elantra Sport 2.0 GDI Mobil 1 5W30 & OEM/Mann W811/80 Filter
2018 Hyundai Santa Fe Sport AWD 2.0T Castrol Edge 5W40 & OEM/Mann W811/80 Filter
Re: Draining oil hot or cold questions? [Re: Bottom_Feeder] #4585331
11/26/17 10:29 AM
11/26/17 10:29 AM
Joined: Oct 2009
Posts: 4,041
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline

Joined: Oct 2009
Posts: 4,041
Wet side WA
Originally Posted By: Bottom_Feeder
3. I drain it warm.


thumbsup


2004 Corolla 130017
Out: EDGE EP 5W-30 Bosch 3311 7156 Miles
In: Havoline Pro DS 10w-30 Purolator PureOne 3-14-19 129693
2006 Duramax 74725
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: Draining oil hot or cold questions? [Re: ZZman] #4585332
11/26/17 10:30 AM
11/26/17 10:30 AM
Joined: Jan 2009
Posts: 6,804
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 6,804
New England
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.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Draining oil hot or cold questions? [Re: ZZman] #4585333
11/26/17 10:31 AM
11/26/17 10:31 AM
Joined: Oct 2002
Posts: 37,055
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline

Joined: Oct 2002
Posts: 37,055
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.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Draining oil hot or cold questions? [Re: ZZman] #4585344
11/26/17 10:39 AM
11/26/17 10:39 AM
Joined: Mar 2015
Posts: 12,401
In the shop
53' Stude Offline
53' Stude  Offline

Joined: Mar 2015
Posts: 12,401
In the shop
Yep, I extract my oil when it’s warm after a nice drive. Oil extractor is way to go smile



Re: Draining oil hot or cold questions? [Re: ZZman] #4585346
11/26/17 10:39 AM
11/26/17 10:39 AM
Joined: Dec 2014
Posts: 1,686
'murica
Ethan1 Offline
Ethan1  Offline

Joined: Dec 2014
Posts: 1,686
'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?

Re: Draining oil hot or cold questions? [Re: ZZman] #4585351
11/26/17 10:44 AM
11/26/17 10:44 AM
Joined: Jun 2003
Posts: 34,077
ME
eljefino Offline
eljefino  Offline

Joined: Jun 2003
Posts: 34,077
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.

Re: Draining oil hot or cold questions? [Re: ZZman] #4585353
11/26/17 10:44 AM
11/26/17 10:44 AM
Joined: Mar 2012
Posts: 804
BerksCounty/Pa.
thorromig Offline
thorromig  Offline

Joined: Mar 2012
Posts: 804
BerksCounty/Pa.
When hot with oil/particulates in suspension.


00 Dodge Ram 5.2L 4x4 Edge 10W30 FU (91K)
08 Acura TL Type S 3.5L PUPP 5W20 FU (101K)
17 Jetta TSI SE 1.4L Turbo - Edge 0W40 FU (Hers) (4K)
Re: Draining oil hot or cold questions? [Re: ZZman] #4585363
11/26/17 10:56 AM
11/26/17 10:56 AM
Joined: Aug 2014
Posts: 1,454
Gulf Coast, MS
3800Series Offline
3800Series  Offline

Joined: Aug 2014
Posts: 1,454
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.

Re: Draining oil hot or cold questions? [Re: ZZman] #4585369
11/26/17 11:08 AM
11/26/17 11:08 AM
Joined: Jun 2003
Posts: 18,431
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 18,431
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.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Draining oil hot or cold questions? [Re: ZZman] #4585382
11/26/17 11:15 AM
11/26/17 11:15 AM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
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.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Draining oil hot or cold questions? [Re: knerml] #4585387
11/26/17 11:17 AM
11/26/17 11:17 AM
Joined: Dec 2016
Posts: 8,017
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,017
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Draining oil hot or cold questions? [Re: ZZman] #4585389
11/26/17 11:18 AM
11/26/17 11:18 AM
Joined: Sep 2010
Posts: 8,210
Texas
4WD Online confused
4WD  Online Confused

Joined: Sep 2010
Posts: 8,210
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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