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#4633424 - 01/13/18 09:42 AM Black Oil
Jason1221 Offline

Registered: 04/27/10
Posts: 15
Loc: USA
Purchased a 2014 chevy 2500hd with a 6.0 engine with 90,000 miles on it. I knew the truck and all are hwy miles the old owner had always changed the oil with mobil 1 5w-30 full synthetic every 5000 miles. Iv done two oil changes with the same oil in it and before i get 3000 miles on it the oil gets really really really black. Has anyone ever had this issue before? Engine runs great!

Edited by Jason1221 (01/13/18 09:43 AM)

#4633443 - 01/13/18 09:58 AM Re: Black Oil [Re: Jason1221]
Snagglefoot Online   content

Registered: 12/31/17
Posts: 260
Loc: Alberta
At 5000 miles how far are you along on the oil monitor, in percentage. I have essentially the same engine with 150,000 miles in a 2008 3/4 ton Suburban. Just had a look; at 70 % remaining itís still light brown. Always used Synthetic 5-30, often M-1. Iíll monitor this and let you when it turns black, and yes, when I change oil at 0 % , itís black.


Edited by Snagglefoot (01/13/18 10:12 AM)

#4633444 - 01/13/18 09:58 AM Re: Black Oil [Re: Jason1221]
farrarfan1 Offline

Registered: 06/24/04
Posts: 1503
Loc: Indiana
The below is what you get if you google "black oil". It will take a while to read all of the threads on this subject.
If laughter is the best medicine, then why do sick people go to doctors instead of comedians?

#4633454 - 01/13/18 10:10 AM Re: Black Oil [Re: Jason1221]
ARB1977 Offline

Registered: 06/12/05
Posts: 4999
Loc: North Texas
Get a uoa done if youíre concerned.
2015 Tacoma 4.0L 52K (as of 8-17-17)
M1 EP 5W30 & BioTech / Toyota filter

2008 CRV 2.4L 172K (as of 12-18-17)
Maxlife 5W20 / M1 filter

#4633459 - 01/13/18 10:13 AM Re: Black Oil [Re: Snagglefoot]
Jason1221 Offline

Registered: 04/27/10
Posts: 15
Loc: USA
At 5000 miles it was 30%

#4633466 - 01/13/18 10:21 AM Re: Black Oil [Re: Jason1221]
Snagglefoot Online   content

Registered: 12/31/17
Posts: 260
Loc: Alberta
Originally Posted By: Jason1221
At 5000 miles it was 30%

OK, Iíll report back when mine is definitely black, or at 30%, Whichever comes first. Currently putting on about 1,000 miles per month.


#4633468 - 01/13/18 10:22 AM Re: Black Oil [Re: Jason1221]
FZ1 Offline

Registered: 02/07/08
Posts: 4709
Loc: Texas
I think the Boron in the add pack is turning is turning the oil black. The Boron is also plating you cylinder bores.. Not a bad thing.

#4633533 - 01/13/18 11:02 AM Re: Black Oil [Re: Jason1221]
toneydoc Offline

Registered: 12/16/11
Posts: 1607
Loc: War Eagle
Mobil1 is great oil. Just doing its job. Follow your OLM and the engine will be just fine
1994 Jeep 155k Mobil 5000 5w30
2014 Camry 28k Mobil 5000 5w30
2010 Sebring 47k Autozone syn 10w30
2014 HD Ultra 33k Mobil1 15w50
2012 Rav4 33k PP 5w20

#4633556 - 01/13/18 11:35 AM Re: Black Oil [Re: Jason1221]
WobblyElvis Offline

Registered: 09/23/14
Posts: 1192
Loc: Toronto Canada
Cut open the next used oil filter and look for black/carbon/soot in the pleats of the media. Also look for oil on the throttle plate of the throttle body. These things suggest combustion products are blowing by the piston rings and contaminating the oil and quickly turning it black. The PCV system should be checked.
Does the engine consume oil?

#4633558 - 01/13/18 11:37 AM Re: Black Oil [Re: Jason1221]
PeterPolyol Offline

Registered: 03/06/16
Posts: 793
Loc: toronto
Mobil 1 is incredible. It's engine oil, isn't that amazing?
BREAKING NEWS: intended to break your spirit

#4633559 - 01/13/18 11:38 AM Re: Black Oil [Re: WobblyElvis]
Jason1221 Offline

Registered: 04/27/10
Posts: 15
Loc: USA
No sir it dont use a drop of oil