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Unknown 75w140, 12 Jeep Wrangler, 62K #4807554 07/07/18 09:33 AM
Joined: Aug 2011
Posts: 256
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dhellman12 Offline OP
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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 - 284hrs
12 Jeep 3.8L - Amsoil ASL 5w30 74K
04 DMax 6.6L - Amsoil AME 15w40 238K
00 WS6 5.7L - Amsoil ASL 5w30 256K
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807570 07/07/18 10:01 AM
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Posts: 19,753
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Chris142 Offline
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I would have changed it. therear axle fluid in my Jeep was gray @36k


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807575 07/07/18 10:04 AM
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Popsy Offline
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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, M1 0W40
Mazda 6 2.3, Castrol 0W30 | Colt Ralliart, 300V 5W40
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807587 07/07/18 10:18 AM
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Rand Offline
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Iron at 353? I would change it.. looks like possible factory fill.


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807611 07/07/18 10:42 AM
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Posts: 256
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dhellman12 Offline OP
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Universal average for Iron is 731, so it's still well below the typical report for a Dana 44.


05 Kawasaki BF750 - 284hrs
12 Jeep 3.8L - Amsoil ASL 5w30 74K
04 DMax 6.6L - Amsoil AME 15w40 238K
00 WS6 5.7L - Amsoil ASL 5w30 256K
Re: Unknown 75w140, 12 Jeep Wrangler, 62K [Re: dhellman12] #4807776 07/07/18 02:43 PM
Joined: Dec 2014
Posts: 621
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FastLane Online Content
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Probably factory fill


2010 Silverado 4.8 4x4 Mobil 1 5W30 Fram XG10060
2002 Mustang GT 4.6 Mobil 1 5W30 Fram XG2
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
Joined: May 2007
Posts: 8,216
dnewton3 Offline
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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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