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How long after a diesel OC does the oil turn dark? #4612880
12/24/17 10:30 AM
12/24/17 10:30 AM
Joined: Apr 2010
Posts: 293
Suburban Washington DC
atikovi Offline OP
atikovi  Offline OP
Joined: Apr 2010
Posts: 293
Suburban Washington DC
I know dark oil in a diesel doesn't mean it's bad or hasn't been changed in a long time but how soon after an oil and filter change will it turn black? And does the oil in newer clean diesel engines stay clearer longer? Have a 92 Chevy with a 6.5TD that I bought 7 years ago that's been sitting and will do my first oil change on it. Will probably do a second one after a few miles to get everything cleaned out.

Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4612883
12/24/17 10:34 AM
12/24/17 10:34 AM
Joined: Dec 2016
Posts: 453
Indiana
5AcresAndAFool Offline
5AcresAndAFool  Offline
Joined: Dec 2016
Posts: 453
Indiana
Have a 09 6.4l Powerstroke in a work truck and it stays clean looking for about 5 minutes after you change it...lol

Not quite that extreme but after it runs you start to see some darkening in the new oil and after a few days you cant tell it has been changed recently.

AFAIK even new diesels darken their oil quickly, unless something has changed in the past few years.

Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4612891
12/24/17 10:40 AM
12/24/17 10:40 AM
Joined: Oct 2004
Posts: 7,991
Cincinnati, OH, USA
bullwinkle Online confused
bullwinkle  Online Confused
Joined: Oct 2004
Posts: 7,991
Cincinnati, OH, USA
It depends on the diesel engine-for instance, the 6.2 GMC in my sig will actually stay reasonably clear for 1000-1500 miles, but the Cummins in the Ram, with it's in-cylinder EGR and 3rd injection event, gets pretty black in the first couple miles. My old '02 Ram Cummins with VP44 IP and no EGR would also take 1000 miles or so to turn black.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4612895
12/24/17 10:42 AM
12/24/17 10:42 AM
Joined: Oct 2010
Posts: 5,287
Florida
Artem Offline
Artem  Offline
Joined: Oct 2010
Posts: 5,287
Florida
When I disabled all the emissions equipment in my 2004 Volvo Semi, the oil would stay clean for THOUSANDS of miles.

With EGR working, the oil was black right after an oil change during the oil level check. duh


2014 Mazda 3 Hatch 2.0L & 6spd - Idemitsu 0w20 Synthetic @ $0.75 a quart. (thanks Advance Auto Parts for the awesome deal)
Re: How long after a diesel OC does the oil turn dark? [Re: 5AcresAndAFool] #4612897
12/24/17 10:43 AM
12/24/17 10:43 AM
Joined: Sep 2009
Posts: 16,026
OH
fdcg27 Offline
fdcg27  Offline
Joined: Sep 2009
Posts: 16,026
OH
Same for the old Mercedes diesels I had. The oil darkened very quickly after a change.
The oil would drain out jet black, darker than anything you'd ever see with a gasser and also had a distinctive scent.


17 Forester 18K VME 0W-20
12 Accord LX 92K PP 5W-20
09 Forester 95K M1HM 10W-30
01 Focus ZX3 118K PP 5W-20
96 Accord LX 104K T5 10W-30
95 318i
Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4612902
12/24/17 10:50 AM
12/24/17 10:50 AM
Joined: Jun 2014
Posts: 1,776
Ca.
UncleDave Offline
UncleDave  Offline
Joined: Jun 2014
Posts: 1,776
Ca.
With a standard fill flow filter?

Within 5 minutes.

With a bypass filter, or a dual stage strata pour venturi - its stays clear a long time .

UD


Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4612905
12/24/17 10:57 AM
12/24/17 10:57 AM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Don't expect it to be clean for more than just a couple minutes, any time soon. I can't speak for the newer, cleaner, common-rail diesels, but every mech. injection oil burner I've changed oil on - even ones that were serviced regularly, at mfg. intervals - it's pretty much black when you check the level after start-up. The only exceptions to that I've seen (with conventional filtration) are engines that were substantially, regularly over-serviced.

Last edited by Alex_V; 12/24/17 10:58 AM.

I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K
Re: How long after a diesel OC does the oil turn dark? [Re: fdcg27] #4612910
12/24/17 11:06 AM
12/24/17 11:06 AM
Joined: Dec 2002
Posts: 42,088
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,088
New Jersey
Originally Posted By: fdcg27
Same for the old Mercedes diesels I had. The oil darkened very quickly after a change.
The oil would drain out jet black, darker than anything you'd ever see with a gasser and also had a distinctive scent.


That is my experience too. It doesn't take much carbon black to make ink. It doesn't take much oil residue to make the oil go jet black.

Re: How long after a diesel OC does the oil turn dark? [Re: Alex_V] #4612911
12/24/17 11:06 AM
12/24/17 11:06 AM
Joined: Sep 2010
Posts: 7,560
SE Texas
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,560
SE Texas
Originally Posted By: Alex_V
I can't speak for the newer, cleaner, common-rail diesels...
I have a 2015 Ford 6.7L Powerstroke and it takes minutes for the oil to begin to turn black, but it remains dark translucent for about 100-500 miles (depending on regens) and after that it is coal black (and stains like it too).


2018 MB AMG GLC43 3.0L Coupe - Castrol 0W-40/Purflux
2018 MB C300 2.0L - M1 0W-40/OEM
2015 F-250 6.7L PS Diesel - Delo 15W-40/CQ Blue
2014 Explorer 3.5L Limited - M1 AFE 0W-20/FU
Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4612923
12/24/17 11:16 AM
12/24/17 11:16 AM
Joined: Jan 2011
Posts: 2,944
PV Az
AZjeff Offline
AZjeff  Offline
Joined: Jan 2011
Posts: 2,944
PV Az
In the Duramax I had it stayed clean until I poured it in the filler.


86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
16 Silverado 1500 4.3, DI, AFM 5W-30 PP

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

Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4612924
12/24/17 11:17 AM
12/24/17 11:17 AM
Joined: Jun 2003
Posts: 17,376
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,376
Deplorable in apple valley, ca
My 87.... as soon as you pour it in.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4612932
12/24/17 11:27 AM
12/24/17 11:27 AM
Joined: Mar 2004
Posts: 20,760
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,760
Upstate NY
In my Powerstroke I do not change the bypass every time so some old oil is in the bypass filter. Turns black when checking the dipstick after the initial start-up after the oil change.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4613206
12/24/17 04:40 PM
12/24/17 04:40 PM
Joined: Jul 2003
Posts: 4,755
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,755
New Zealand
Do a blotter test after you've changed the oil - it won't be as dirty as it looks, the test will come out like clean oil.


1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4613333
12/24/17 08:08 PM
12/24/17 08:08 PM
Joined: Apr 2010
Posts: 293
Suburban Washington DC
atikovi Offline OP
atikovi  Offline OP
Joined: Apr 2010
Posts: 293
Suburban Washington DC
Can I use Lubriguard 15W40 CJ-4/SM I've had on the shelf for years? Don't expect to start the truck below 20F but the 15W seems thick for an engine that has high compression already working against it in cold start ups.

Re: How long after a diesel OC does the oil turn dark? [Re: atikovi] #4613361
12/24/17 08:51 PM
12/24/17 08:51 PM
Joined: Dec 2016
Posts: 6,263
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,263
Waco, TX
Originally Posted By: atikovi
Can I use Lubriguard 15W40 CJ-4/SM I've had on the shelf for years? Don't expect to start the truck below 20F but the 15W seems thick for an engine that has high compression already working against it in cold start ups.


All through the 80's and 90's that was all we used in North Dakota winters.

Synthetic oil that was less that $10 a quart (!) didn't really exist much.

I hand-crank started a Farmall M with 30W in it when it was -35*F. It lit right off.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
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