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#4089522 - 05/06/16 02:09 PM Amsoil 75w90, 45K, 04 Chevy Tahoe
dhellman12 Offline


Registered: 08/29/11
Posts: 239
Loc: 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 - 262hrs
04DMax 6.6L - Amsoil AME 15w40 222K
04Tahoe 5.3L - Amsoil ASL 5w30 235K
00WS6 5.7L - Amsoil ASL 5w30 253K

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#4089566 - 05/06/16 03:02 PM Re: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12]
901Memphis Offline


Registered: 08/14/10
Posts: 12893
Loc: Northern Kentucky
Very nice
_________________________
2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980

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#4091829 - 05/09/16 01:28 AM Re: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: Malaysia
The [email protected]*C appears highly sheared from it's nominal 16.8 cSt .... I would replace said oil well before 45K miles.

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#4091843 - 05/09/16 02:42 AM Re: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12]
2015_PSD Online   content


Registered: 09/26/10
Posts: 7243
Loc: SE Texas
You may want to use 75W-110 in the future if the shearing continues to give you a little more of a buffer.
_________________________
2018 MB AMG GLC43 3.0L Coupe - M1 0W-40/OEM
2018 MB C300 2.0L - M1 0W-40/OEM
2015 F-250 6.7L PS Diesel - Delo 5W-40/CQ Blue
2014 Explorer 3.5L Limited - M1 AFE 0W-20/FU

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#4448659 - 07/03/17 07:16 PM Re: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12]
Chubbs Offline


Registered: 06/30/17
Posts: 2
Loc: DFW, TX
Check your PM. Hope to hear back when you get a minute.

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#4449741 - 07/04/17 06:55 PM Re: Amsoil 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12]
CT8 Offline


Registered: 10/09/14
Posts: 11009
Loc: Idaho
75W-140 syn gear oil. Go for the gusto.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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