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Oil looks cleaner at operating temp #4563919
11/04/17 01:19 PM
11/04/17 01:19 PM
Joined: Jul 2017
Posts: 183
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 183
Venezuela, South America
My engine oil looks almost transparent when the engine is at operating temp and it looks slightly dark when the engine is cold.

What causes this? The oil additives are the ones responsible for this I guess. And also the dirt falls down in to the pan when the engine is cold.

What are your thoughts?

Re: Oil looks cleaner at operating temp [Re: Emanuel] #4563927
11/04/17 01:26 PM
11/04/17 01:26 PM
Joined: Oct 2014
Posts: 11,856
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,856
Idaho
The oil film is thinner on the dip stick when the oil is hot.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Oil looks cleaner at operating temp [Re: Emanuel] #4563932
11/04/17 01:29 PM
11/04/17 01:29 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
The dirt is more concentrated when all the cold oil is in the pan.

Re: Oil looks cleaner at operating temp [Re: Merkava_4] #4563939
11/04/17 01:35 PM
11/04/17 01:35 PM
Joined: Oct 2014
Posts: 11,856
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,856
Idaho
Splain the mechanics of that MERK.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Oil looks cleaner at operating temp [Re: Emanuel] #4563952
11/04/17 01:42 PM
11/04/17 01:42 PM
Joined: Dec 2012
Posts: 556
Cave City KY
jakewells Offline
jakewells  Offline
Joined: Dec 2012
Posts: 556
Cave City KY
my f150 does that also but it's normal.


1994 Ford F150 302 4R70
Chevron Delo SAE 30 CF/SL Fram XG8A

1978 Chevy Nova 250 I6 Borg Warner T5
Rotella 10W40 Fram XG5

Re: Oil looks cleaner at operating temp [Re: Emanuel] #4563953
11/04/17 01:43 PM
11/04/17 01:43 PM
Joined: Jan 2009
Posts: 6,205
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,205
New England
Why is there dirt in your oil!?


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter
Re: Oil looks cleaner at operating temp [Re: CT8] #4563959
11/04/17 01:51 PM
11/04/17 01:51 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Originally Posted By: CT8
Splain the mechanics of that MERK.


When the engine is at operating temp, even though the engine is presently shut off with most of the oil (but not all the oil) back in the pan, the oil is still more spread out throughout the engine. When the oil is more spread out, so is the dirt. With cold oil, most of the dirt is at the bottom of the pan where the dipstick is.

Re: Oil looks cleaner at operating temp [Re: gathermewool] #4564008
11/04/17 02:47 PM
11/04/17 02:47 PM
Joined: Jul 2010
Posts: 18,733
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 18,733
PNW
Originally Posted By: gathermewool
Why is there dirt in your oil!?


Because he uses those inefficient XPs. laugh

Re: Oil looks cleaner at operating temp [Re: ZeeOSix] #4564237
11/04/17 07:19 PM
11/04/17 07:19 PM
Joined: Jan 2009
Posts: 6,205
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,205
New England
Originally Posted By: ZeeOSix
Originally Posted By: gathermewool
Why is there dirt in your oil!?


Because he uses those inefficient XPs. laugh


crackmeup


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter
Re: Oil looks cleaner at operating temp [Re: CT8] #4564418
11/05/17 12:09 AM
11/05/17 12:09 AM
Joined: Jan 2016
Posts: 802
NC
Vladiator Offline
Vladiator  Offline
Joined: Jan 2016
Posts: 802
NC
Originally Posted By: CT8
The oil film is thinner on the dip stick when the oil is hot.

I lean towards this answer.
In my riding mower I use QuickSilver 25w40 oil. Going in cold it looks pretty viscous, coming out hot it flows like water.
So lower oil viscosity at operating temperature will seem more transparrent on the dipstick due to thinner film.


2000 Lexus GS300-361k
1999 Lexus GS400-213k
2006 Toyota Camry-187k
2006 Toyota Highlander Hybrid-125k
2009 Scion xB-120k
2013 VW Tiguan-120k
2009 Toyota Tacoma-60k
Re: Oil looks cleaner at operating temp [Re: CT8] #4564481
11/05/17 06:25 AM
11/05/17 06:25 AM
Joined: May 2008
Posts: 84
Littleton, CO
jtfmdyk Offline
jtfmdyk  Offline
Joined: May 2008
Posts: 84
Littleton, CO
Originally Posted By: CT8
Splain the mechanics of that MERK.


stick a knife in a bowl of maple syrup at room temperature, pull it out and look at it

stick it in a bowl of warm maple syrup

cold clings more, thicker layer is darker


2003 S2000
2002 CR-V
2006 Accord EX

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