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Unknown 75w140, 12 Jeep Wrangler, 62K #4807554
07/07/18 09:33 AM
07/07/18 09:33 AM
Joined: Aug 2011
Posts: 252
Texas
dhellman12 Offline OP
dhellman12  Offline OP
Joined: Aug 2011
Posts: 252
Texas
Fluid was not replaced at the time of the sample. We just purchased this vehicle and had UOA's performed on the front & rear diff.

Make/Model: Dana 44 Differential (Rear)
Vehicle: 2012 Jeep Wrangler Rubicon Unlimited

Code:
OIL             Unknown (Factory fill?)
MILES IN USE    Unknown
MILES ON UNIT   61,945
SAMPLE TAKEN    6/19/18		
MAKE UP OIL	0		

ALUMINUM	0		
CHROMIUM	20		
IRON		353
COPPER		2		
LEAD		0		
TIN		0		
MOLYBDENUM	2		
NICKEL		8		
MANGANESE	7		
SILVER		0		
TITANIUM	0		
POTASSIUM	2		
BORON		226		
SILICON		14		
SODIUM		5		
CALCIUM		9		
MAGNESIUM	2		
PHOSPHORUS	2228
ZINC		21		
BARIUM		1		
     
SUS @ 210F	72.6		
Visc @ 100C	13.63		
Flashpoint	410		
Water %		0.0		
Insolubles %	0.1
TAN		3.7


Blackstone comments:
This sample from the rear diff looks pretty good too. We're not sure if it's the factory fill or not, but regardless, these results don't point to any issues. Iron and chrome are higher than we saw from the front axle, but that's not anything to be concerned about. The rear diff typically sees quite a bit more use so it's common to see more metal in its oil. No contamination was found and the viscosity is in spec. Insolubles (solids) are pretty minimal at 0.1%. The TAN of 3.7 is still low enough to show no excess acidity. Nice pair of reports! Just check back in 20K miles or so.


05 Kawasaki BF750 - 277hrs
12 Jeep 3.8L - Amsoil ASL 5w30 68K
04 DMax 6.6L - Amsoil AME 15w40 230K
00 WS6 5.7L - Amsoil ASL 5w30 254K
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807570
07/07/18 10:01 AM
07/07/18 10:01 AM
Joined: Jun 2003
Posts: 17,825
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,825
Deplorable in apple valley, ca
I would have changed it. therear axle fluid in my Jeep was gray @36k


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807575
07/07/18 10:04 AM
07/07/18 10:04 AM
Joined: May 2015
Posts: 946
Frogland / Brittany / Canada
Popsy Offline
Popsy  Offline
Joined: May 2015
Posts: 946
Frogland / Brittany / Canada
Viscosity seems pretty low for a 140, I would have changed it too, even if the it looked fine. I guess it's the BITOG way!


96 Barchetta, 300V 5W40 | Forfour 95, SHU 0W40
Mazda 6 2.3, M1 0W40 | Colt Ralliart, 300V 0W40
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807587
07/07/18 10:18 AM
07/07/18 10:18 AM
Joined: Aug 2003
Posts: 13,141
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,141
NE,Ohio
Iron at 353? I would change it.. looks like possible factory fill.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807611
07/07/18 10:42 AM
07/07/18 10:42 AM
Joined: Aug 2011
Posts: 252
Texas
dhellman12 Offline OP
dhellman12  Offline OP
Joined: Aug 2011
Posts: 252
Texas
Universal average for Iron is 731, so it's still well below the typical report for a Dana 44.


05 Kawasaki BF750 - 277hrs
12 Jeep 3.8L - Amsoil ASL 5w30 68K
04 DMax 6.6L - Amsoil AME 15w40 230K
00 WS6 5.7L - Amsoil ASL 5w30 254K
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807776
07/07/18 02:43 PM
07/07/18 02:43 PM
Joined: Dec 2014
Posts: 509
MB - Manitoba
FastLane Offline
FastLane  Offline
Joined: Dec 2014
Posts: 509
MB - Manitoba
Probably factory fill


2010 Silverado 4.8 4x4 Mobil 1 5W30 ACDelco PF48E
2002 Mustang GT 4.6 Mobil 1 5W30 MC FL-820S
1966 Cessna 150 Phillips 20W50
2013 Mercury 30hp Mystic 25W40
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4823317
07/26/18 04:45 AM
07/26/18 04:45 AM
Joined: May 2007
Posts: 7,628
Indianapolis, IN
dnewton3 Offline
dnewton3  Offline
Joined: May 2007
Posts: 7,628
Indianapolis, IN
Presuming this is FF, the wear is not bad at all. After all, for FF, all the "break in" is still in there.
The average is 5.7ppm Fe / 1k miles. With break in metals still floating around after 62k miles.
I've seen younger Chevy engines shed that much Fe after several OCIs.
This isn't bad whatsoever.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money

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