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Amsoil 75w90, 45K, 04 Chevy Tahoe #4089522
05/06/16 01:09 PM
05/06/16 01:09 PM
Joined: Aug 2011
Posts: 252
Texas
dhellman12 Offline OP
dhellman12  Offline OP
Joined: Aug 2011
Posts: 252
Texas
Fluid was replaced at time of sample.

Make/Model: GM Differential (Front)
Vehicle: 2004 Chevrolet Tahoe

Code:
OIL             Amsoil 75w90	Amsoil 75w90	Unknown
MILES IN USE    45,029		29,386		Unknown
MILES ON UNIT   203K		158K		123K
SAMPLE TAKEN    4/25/16		11/8/13		5/3/11		
MAKE UP OIL	0		0		0		

ALUMINUM	1		2		7		
CHROMIUM	0		0		1		
IRON		85		133		346		
COPPER		3		5		8		
LEAD		0		1		1		
TIN		2		0		0		
MOLYBDENUM	2		9		82		
NICKEL		0		2		4		
MANGANESE	1		2		5		
SILVER		0		1		0		
TITANIUM	0		0		1		
POTASSIUM	0		1		0		
BORON		106		95		89		
SILICON		31		36		38		
SODIUM		1		2		4		
CALCIUM		6		12		80		
MAGNESIUM	0		2		10		
PHOSPHORUS	891		862		579		
ZINC		22		41		90		
BARIUM		0		0		1		
     
SUS @ 210F	67.3		78.6		56.0		
Visc @ 100C	12.23		15.16		9.07		
Flashpoint	415		415		370		
Water %		0.0		0.0		0.0		
Insolubles %	0.2		0.2		0.3
TAN		2.3		1.7		NA


Oil Analysis Comments:
The front differential on this Tahoe appears to be in very good shape, with low wear metal readings giving us no reason to suspect any internal problems. Iron, indicative of steel wear, is exceptionally low for the miles. The oil tested to be in good condition, as well, with viscosity appropriate for 75W/90, and no sign of significant water or dirt contamination. Solids (insolubles) read low at 0.2%, indicating very little oxidation due to heat, and the TAN of 2.3 shows that little acidity built up. Feel free to try 60,000 miles next time and check back then to see the effects.


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: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12] #4089566
05/06/16 02:02 PM
05/06/16 02:02 PM
Joined: Aug 2010
Posts: 12,906
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,906
Northern Kentucky
Very nice


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
Re: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12] #4091829
05/09/16 12:28 AM
05/09/16 12:28 AM
Joined: Sep 2015
Posts: 2,471
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,471
Malaysia
The [email protected]*C appears highly sheared from it's nominal 16.8 cSt .... I would replace said oil well before 45K miles.

Re: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12] #4091843
05/09/16 01:42 AM
05/09/16 01:42 AM
Joined: Sep 2010
Posts: 7,594
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,594
Planet Earth
You may want to use 75W-110 in the future if the shearing continues to give you a little more of a buffer.

Re: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12] #4448659
07/03/17 06:16 PM
07/03/17 06:16 PM
Joined: Jun 2017
Posts: 2
DFW, TX
Chubbs Offline
Chubbs  Offline
Joined: Jun 2017
Posts: 2
DFW, TX
Check your PM. Hope to hear back when you get a minute.

Re: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12] #4449741
07/04/17 05:55 PM
07/04/17 05:55 PM
Joined: Oct 2014
Posts: 12,557
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,557
Idaho
75W-140 syn gear oil. Go for the gusto.


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2018 Ford F350 6.2

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