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#4568637 - 11/09/17 09:04 AM Amsoil SVG 75w90, 45K, 04 Chevy Tahoe
dhellman12 Offline


Registered: 08/29/11
Posts: 239
Loc: Texas
Will likely extend the next run to 55K based on Blackstone's recommendations. Overall looks like things are getting much better since we bought this one.

Make/Model: GM Differential
Vehicle: 2004 Chevrolet Tahoe

Code:
OIL             SVG 75w90	SVG 75w90	SVG 75w90	Unknown
MILES IN USE    45,514		35,159		25,128		Unknown
MILES ON UNIT   229K		183K		148K		123K
SAMPLE TAKEN    10/29/17	4/16/15		3/18/13		5/3/11		
MAKE UP OIL	0		0		0		0		

ALUMINUM	1		2		3		4		
CHROMIUM	0		1		1		2		
IRON		102		264		255		672		
COPPER		1		5		7		28		
LEAD		0		0		0		1		
TIN		0		0		0		0		
MOLYBDENUM	0		1		0		3		
NICKEL		2		4		4		11		
MANGANESE	3		6		6		26		
SILVER		0		0		0		0		
TITANIUM	0		0		2		0		
POTASSIUM	0		0		0		0		
BORON		84		93		100		179		
SILICON		81		145		162		13		
SODIUM		4		5		6		34		
CALCIUM		6		5		9		42		
MAGNESIUM	0		2		3		3		
PHOSPHORUS	745		884		913		1683		
ZINC		5		13		21		68		
BARIUM		0		0		0		1		
     
SUS @ 210F	79.9		83.2		88.3		69.0		
Visc @ 100C	15.50		16.31		17.57		12.70		
Flashpoint	425		400		415		370		
Water %		0.0		0.0		0.0		0.0		
Insolubles %	0.2		0.2		0.5		0.2
TAN		2.6		1.4		1.8		NA	


Blackstone comments:
This is the longest oil run across the page, so it's great to see iron so low. The other metals followed iron's example, so we don't see anything cautionary here. Silicon seems to be slowly washing out of the system. It's probably just additive or harmless sealer as opposed to abrasive dirt contamination. No moisture shows up and insolubles are very low. The viscosity is fine for 75W/90 and the TAN of 2.6 shows little acidity. Great report for your rear differential
_________________________
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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#4568648 - 11/09/17 09:12 AM Re: Amsoil SVG 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12]
2015_PSD Offline


Registered: 09/26/10
Posts: 7243
Loc: SE Texas
It could have gone 2x the mileage with no issues. The majority of wear that occurs in an axle happens from 1-10K miles which is why the iron trends downward exponentially on a per mile basis despite the runs becoming longer and longer. I have seen this in every UOA posted UNLESS there was a problem with the axle.

You can see similar behavior in the UOAs of my 2010 FX4.
_________________________
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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#4568814 - 11/09/17 11:37 AM Re: Amsoil SVG 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Quote:
The majority of wear that occurs in an axle happens from 1-10K miles which is why the iron trends downward exponentially on a per mile basis despite the runs becoming longer and longer. I have seen this in every UOA posted UNLESS there was a problem with the axle.


thumbsup

The important thing is the ferrous metals are TRENDING downward.

In your environment I would use a 75W110 from Lubrication Engineers or Amsoil's SVT:

https://www.amsoil.com/lit/databulletins/g2043.pdf


Edited by MolaKule (11/09/17 11:38 AM)

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#4568821 - 11/09/17 11:47 AM Re: Amsoil SVG 75w90, 45K, 04 Chevy Tahoe [Re: MolaKule]
2015_PSD Offline


Registered: 09/26/10
Posts: 7243
Loc: SE Texas
Originally Posted By: MolaKule
In your environment I would use a 75W110 from Lubrication Engineers or Amsoil's SVT:

https://www.amsoil.com/lit/databulletins/g2043.pdf
+1 - I forgot to mention that.
_________________________
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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#4568968 - 11/09/17 02:03 PM Re: Amsoil SVG 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12]
jaj Offline


Registered: 08/21/03
Posts: 1060
Loc: Vancouver, Canada
Where'd all that silicon come from? The SVG VOA shows 13ppm, and the original unknown fill didn't show much, so it looks like dirt got in at the first change. That could contribute to the high iron.

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#4569020 - 11/09/17 03:01 PM Re: Amsoil SVG 75w90, 45K, 04 Chevy Tahoe [Re: jaj]
2015_PSD Offline


Registered: 09/26/10
Posts: 7243
Loc: SE Texas
Originally Posted By: jaj
Where'd all that silicon come from? The SVG VOA shows 13ppm, and the original unknown fill didn't show much, so it looks like dirt got in at the first change. That could contribute to the high iron.
The higher silicon levels after the first OC could be from silicone gasket sealer. I tend to think with the first OC at 123K and a Fe reading of 672PPM that it may take a bit to wash out ( perhaps not 60K miles over two additional OC's though).
_________________________
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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#4575703 - 11/16/17 05:45 AM Re: Amsoil SVG 75w90, 45K, 04 Chevy Tahoe [Re: dhellman12]
dnewton3 Offline



Registered: 05/14/07
Posts: 7392
Loc: Indianapolis, IN
Based on the design of most rear axles (I presume that's what we're looking at here), we should agree than not all the lube comes out upon a drain cycle; a LOT is left in the tubes.
Therefore the very high Fe at the first UOA was probably the result of a very long OCI. Then the subsequent OCIs / UOAs are showing a downward trend due to much of the residual being drained out time after time.

I'd advocate for 75k miles at a min with the SVG; maybe longer.

At 229k miles, not sure how much life is left in the vehicle overall. Mechanically it may be OK? What about rust, etc? At what point do you start to pare down on the expenses? I'm not saying there's been a bad decision thus far, but more a question of where's the practical end of ownership versus the ROI on such expenses like Amsoil and UOAs???
_________________________
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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