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#4807554 - 07/07/18 10:33 AM Unknown 75w140, 12 Jeep Wrangler, 62K
dhellman12 Offline


Registered: 08/29/11
Posts: 243
Loc: 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.
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05 Kawasaki BF750 - 265hrs
12 Jeep 3.8L - Toyota 5w30 63K
04 DMax 6.6L - Amsoil AME 15w40 226K
04 Tahoe 5.3L - Amsoil ASL 5w30 238K
00 WS6 5.7L - Amsoil ASL 5w30 254K

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#4807570 - 07/07/18 11:01 AM Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12]
Chris142 Offline


Registered: 06/05/03
Posts: 16976
Loc: Deplorable in apple valley, ca
I would have changed it. therear axle fluid in my Jeep was gray @36k
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02 Wrangler durablend 10w40
87 F250 traveler 15w40
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Z400 castrol T 10w40
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#4807575 - 07/07/18 11:04 AM Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12]
Popsy Offline


Registered: 05/10/15
Posts: 902
Loc: Frogland / Brittany
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!
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96 Barchetta, Motul 300V 5W40 | 98 Barchetta, Quartz 9000 energy 5W40
05 Forfour 95, SHU 0W40 (gf's car) | 10 Colt Ralliart, 300V 0W40

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#4807587 - 07/07/18 11:18 AM Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12]
Rand Offline


Registered: 08/20/03
Posts: 12740
Loc: NE,Ohio
Iron at 353? I would change it.. looks like possible factory fill.
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2019 Jeep Cherokee Trailhawk 2.0T

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#4807611 - 07/07/18 11:42 AM Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12]
dhellman12 Offline


Registered: 08/29/11
Posts: 243
Loc: Texas
Universal average for Iron is 731, so it's still well below the typical report for a Dana 44.
_________________________
05 Kawasaki BF750 - 265hrs
12 Jeep 3.8L - Toyota 5w30 63K
04 DMax 6.6L - Amsoil AME 15w40 226K
04 Tahoe 5.3L - Amsoil ASL 5w30 238K
00 WS6 5.7L - Amsoil ASL 5w30 254K

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#4807776 - 07/07/18 03:43 PM Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12]
FastLane Offline


Registered: 12/10/14
Posts: 458
Loc: MB - Manitoba
Probably factory fill
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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 Merc 10W30

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