Recent Topics
Toyota 2TR-FE 2.7 questions
by Doublehaul. 12/12/18 12:32 AM
Anybody used Eurolub?
by FordCapriDriver. 12/12/18 12:18 AM
Micro-Green Cut Open
by David1. 12/11/18 11:45 PM
Witch way does this valve work?
by Dylan1303. 12/11/18 11:42 PM
Santa came early..
by leoblack9. 12/11/18 11:22 PM
dropped a zip tie in my prius trans
by eljefino. 12/11/18 09:54 PM
2 Cello's - Some talented fellows right here.
by StevieC. 12/11/18 09:49 PM
Something different for sure - Punjabi Celtic
by StevieC. 12/11/18 09:40 PM
Honda eu200i hiccuping @ low idle - fixed
by Jmoney7269. 12/11/18 09:34 PM
Your dealer is here - Humor
by StevieC. 12/11/18 08:46 PM
1994 Honda Civic LX Main Relay-solder
by Gito. 12/11/18 08:43 PM
Winter/Summer Fuel Economy
by RayCJ. 12/11/18 08:33 PM
0w20 oils - NOACK
by superangrypenguin. 12/11/18 08:19 PM
Liqui Moly Special Tec AA 5w20 API SN
by Johnny248. 12/11/18 08:15 PM
Buy a brand new 1966-1977 Ford Bronco
by StevieC. 12/11/18 07:50 PM
2012 Accord,QSUD 5W20,WIX 57356 filter,3K miles
by aquariuscsm. 12/11/18 07:05 PM
Check out this awsome work!
by Chris142. 12/11/18 06:47 PM
200,000 miles
by Marco620. 12/11/18 06:29 PM
Newest Members
tcoffin014, Schm1d, EagleC, Dinka, MechanicGuy
66654 Registered Users
Who's Online Now
36 registered members (ChrisD46, carviewsonic, Char Baby, bmod305, Bailes1992, 7 invisible), 880 guests, and 40 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics294,964
Posts4,924,974
Members66,654
Most Online2,553
Oct 27th, 2018
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Oil looks cleaner at operating temp #4563919
11/04/17 12:19 PM
11/04/17 12:19 PM
Joined: Jul 2017
Posts: 187
Venezuela, South America
Emanuel Offline OP
Emanuel  Offline OP
Joined: Jul 2017
Posts: 187
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 12:26 PM
11/04/17 12:26 PM
Joined: Oct 2014
Posts: 12,567
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,567
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 12:29 PM
11/04/17 12:29 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 12:35 PM
11/04/17 12:35 PM
Joined: Oct 2014
Posts: 12,567
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,567
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 12:42 PM
11/04/17 12:42 PM
Joined: Dec 2012
Posts: 562
Cave City KY
jakewells Offline
jakewells  Offline
Joined: Dec 2012
Posts: 562
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 12:43 PM
11/04/17 12:43 PM
Joined: Jan 2009
Posts: 6,520
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,520
New England
Why is there dirt in your 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: Oil looks cleaner at operating temp [Re: CT8] #4563959
11/04/17 12:51 PM
11/04/17 12:51 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 01:47 PM
11/04/17 01:47 PM
Joined: Jul 2010
Posts: 19,263
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 19,263
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 06:19 PM
11/04/17 06:19 PM
Joined: Jan 2009
Posts: 6,520
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,520
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 (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Oil looks cleaner at operating temp [Re: CT8] #4564418
11/04/17 11:09 PM
11/04/17 11:09 PM
Joined: Jan 2016
Posts: 849
NC
Vladiator Offline
Vladiator  Offline
Joined: Jan 2016
Posts: 849
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.

Re: Oil looks cleaner at operating temp [Re: CT8] #4564481
11/05/17 05:25 AM
11/05/17 05:25 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

BOB IS THE OIL GUY® Powered by UBB.threads™