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How long before oil turns black #4095527 05/13/16 08:15 AM
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leeaspell Offline OP
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Had an oil change done recently on a 2012 ram 3500 with the cummins. Picked the truck up, drove the 3km home and checked the oil, it was as black as what was in it when I brought it there. I know it's a diesel and they turn the oil black fairly quickly, but that seemed really quick.
Both fords I've owned, a 6.4 and 6.7 would take about 1500km before it was as black as this stuff.


2015 F150 5.0L VWB 5w20, Napa gold
2013 Fusion 2.5L- vwb 5w20, Napa gold



Re: How long before oil turns black [Re: leeaspell] #4095532 05/13/16 08:20 AM
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Your oil wasn't changed. Sorry to tell you.

Re: How long before oil turns black [Re: leeaspell] #4095535 05/13/16 08:22 AM
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Miller88 Online Content
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In a Diesel, the oil turns black almost immediately.


18 Forester 2.5I 6M
00 Jeep XJ
01 F-350 4x4 5M
Re: How long before oil turns black [Re: Bottom_Feeder] #4095539 05/13/16 08:26 AM
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Bgallagher Offline
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Originally Posted By: Bottom_Feeder
Your oil wasn't changed. Sorry to tell you.


+1 That was my thought too. Diesel oil traditionally becomes black pretty quick but it shouldn't be that black that quickly. I think you might have got hosed. Does the oil filter look new?


2017 Chevy Traverse - 28k - Delco Dexos 1 and PF63
2014 Chevy Equinox - 22k - Delco Dexos 1 and PF457G
2015 GMC Terrain - 22k- Delco Dexos 1 and PF457G
Re: How long before oil turns black [Re: Miller88] #4095540 05/13/16 08:26 AM
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abycat Offline
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Originally Posted By: Miller88
In a Diesel, the oil turns black almost immediately.


my 6.0 takes about 1500km to turn black. but I dont have any emissions systems besides pcv in it. I dont think the oil was changed.


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Re: How long before oil turns black [Re: leeaspell] #4095561 05/13/16 08:49 AM
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Dyusik Offline
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I've had oil turn black in 2 min of idle on my first second oci of T6.(jeep)
I'm with Miller on this one.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 111K Frankenbrew, WIX 57173 (4 sale)
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Re: How long before oil turns black [Re: Dyusik] #4095585 05/13/16 09:13 AM
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The oil in my '07 Cummins and '11 Duramax turn the oil black in seconds. My dad's '07.5 and '14 Cummins are the same

As in fill with fresh oil,start truck,wait 10 seconds and shut off. Check the oil and its like it was never changed.

Re: How long before oil turns black [Re: Stewart Fan] #4095616 05/13/16 09:36 AM
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edyvw Offline
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I think it depends on the engine and oil.
If it can help you, in my BMW it turns black maybe in 200 miles, whether I use BMW OEM oil or Mobil1 5W30 ESP.
But as for whether oil was changed or not; that is why I am changing oil in my garage.

Last edited by edyvw; 05/13/16 09:37 AM.

15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: How long before oil turns black [Re: leeaspell] #4095619 05/13/16 09:39 AM
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Kuato Offline
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Originally Posted By: leeaspell
Had an oil change done recently on a 2012 ram 3500 with the cummins. Picked the truck up, drove the 3km home and checked the oil, it was as black as what was in it when I brought it there. I know it's a diesel and they turn the oil black fairly quickly, but that seemed really quick.
Both fords I've owned, a 6.4 and 6.7 would take about 1500km before it was as black as this stuff.


Since your vehicle usually turns oil black in 1500km, and you only went 3, I'd suggest you take a sample and send it to an oil analyzer. Then you either have
(1) Peace of mind or
(2) Evidence

Last edited by Kuato; 05/13/16 09:41 AM.

Thick vs Thin test: 15k / 43k miles complete
Re: How long before oil turns black [Re: leeaspell] #4095626 05/13/16 09:52 AM
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Was the filter changed, too? Maybe too much used oil remained in the system and tinted the new.

Re: How long before oil turns black [Re: leeaspell] #4095645 05/13/16 10:26 AM
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My PSD has a few stages of blackness. Within a few miles the oil turns from clear/amber to a very light gray/black and it is very easy to see through it to see the crosshatch on the dipstick. Within 100 miles it is black and it difficult to see through. Within 500-750 miles, the crosshatch is not visible and it only becomes darker from there to the point of nearly staining anything it touches when I change it at 5K.


2019 Jeep Rubicon Wrangler Unlimited 3.6L V6 [OEM + Factory Fill]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum Euro 0W-40 & Mann filter]
Re: How long before oil turns black [Re: leeaspell] #4095668 05/13/16 10:47 AM
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For those of you who does not/have not dealt with diesel engines, the oil will get black as soon as the engine starts.

Diesel engine produces soot/carbon which is black and the "GOOD" diesel rated oil needs to have the ability to float those soot/carbon which is black instead of becoming a sediment.

Most oil filter cannot filter this soot/carbon particle since they are smaller in size than the filter's ability.


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  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: How long before oil turns black [Re: leeaspell] #4095672 05/13/16 10:50 AM
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AZjeff Offline
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My 07 Duramax will change the oil black immediately, like idling in the driveway after an OC and I KNOW the oil gets changed because I do it. It's the stupid EGR dumping soot into the oil. Freaked me out the first time I changed oil.

People should try to know something before they claim foul play.


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The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa

Re: How long before oil turns black [Re: leeaspell] #4095748 05/13/16 12:28 PM
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My 06 Cummins turns black immediately, and I know it's fresh oil and filter because I do it myself. No all the oil is removed in an oil change and it stains the oil immediately. Don't worry, at least in a Cummins.


I have CDO. It's like OCD except in alphabetical order like it should be.
Re: How long before oil turns black [Re: leeaspell] #4095754 05/13/16 12:37 PM
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Had three different diesels over the years, all were black right after oil change.


03 Porsche 911 Liqui Moly Leichtlauf High Tech 5w-40 & Ceratec & Mahle filter
14 Honda Accord 4dr EX-L 4cyl-M1 5W-30 & WIX
02 Chevy 5.7L van-GTX HM 10W-40 & WIX
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