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#4563919 - 11/04/17 01:19 PM Oil looks cleaner at operating temp
Emanuel Offline


Registered: 07/01/17
Posts: 183
Loc: 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?

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#4563927 - 11/04/17 01:26 PM Re: Oil looks cleaner at operating temp [Re: Emanuel]
CT8 Offline


Registered: 10/09/14
Posts: 10925
Loc: Idaho
The oil film is thinner on the dip stick when the oil is hot.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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#4563932 - 11/04/17 01:29 PM Re: Oil looks cleaner at operating temp [Re: Emanuel]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
The dirt is more concentrated when all the cold oil is in the pan.

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#4563939 - 11/04/17 01:35 PM Re: Oil looks cleaner at operating temp [Re: Merkava_4]
CT8 Offline


Registered: 10/09/14
Posts: 10925
Loc: Idaho
Splain the mechanics of that MERK.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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#4563952 - 11/04/17 01:42 PM Re: Oil looks cleaner at operating temp [Re: Emanuel]
jakewells Offline


Registered: 12/28/12
Posts: 448
Loc: 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 3 on the tree.
Rotella 10W40 Fram TG30


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#4563953 - 11/04/17 01:43 PM Re: Oil looks cleaner at operating temp [Re: Emanuel]
gathermewool Offline


Registered: 01/09/09
Posts: 5987
Why is there dirt in your oil!?

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#4563959 - 11/04/17 01:51 PM Re: Oil looks cleaner at operating temp [Re: CT8]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: 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.

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#4564008 - 11/04/17 02:47 PM Re: Oil looks cleaner at operating temp [Re: gathermewool]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17764
Loc: PNW
Originally Posted By: gathermewool
Why is there dirt in your oil!?


Because he uses those inefficient XPs. laugh

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#4564237 - 11/04/17 07:19 PM Re: Oil looks cleaner at operating temp [Re: ZeeOSix]
gathermewool Offline


Registered: 01/09/09
Posts: 5987
Originally Posted By: ZeeOSix
Originally Posted By: gathermewool
Why is there dirt in your oil!?


Because he uses those inefficient XPs. laugh


crackmeup

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#4564418 - 11/05/17 12:09 AM Re: Oil looks cleaner at operating temp [Re: CT8]
Vladiator Offline


Registered: 01/04/16
Posts: 728
Loc: 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.
_________________________
Thicker oils give protection for severe operations such as driving in mountains, pulling a boat, dusty conditions, short trips, high rpm, overloading, overheating and overcooling. Thin oils give MPG.

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


Registered: 05/05/08
Posts: 84
Loc: 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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