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Unknown fluid/miles, 249K 00 Pontiac WS6 #4095803 05/13/16 01:39 PM
Joined: Aug 2011
Posts: 256
D
dhellman12 Offline OP
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Joined: Aug 2011
Posts: 256
Fluid was replaced at time of sample. Picked this car up a month ago and changed the fluids to get a baseline.

Make/Model: GM Differential (Rear)
Vehicle: 2000 Pontiac Trans-Am WS6

Code:
OIL             Unknown	
MILES IN USE    Unknown	
MILES ON UNIT   249K		
SAMPLE TAKEN    4/22/16		
MAKE UP OIL	0		

ALUMINUM	2		
CHROMIUM	2		
IRON		294		
COPPER		3		
LEAD		0		
TIN		0		
MOLYBDENUM	1		
NICKEL		12		
MANGANESE	3		
SILVER		0		
TITANIUM	1		
POTASSIUM	1		
BORON		5		
SILICON		58		
SODIUM		3		
CALCIUM		24		
MAGNESIUM	4		
PHOSPHORUS	449		
ZINC		16		
BARIUM		0		
     
SUS @ 210F	79.5		
Visc @ 100C	15.4		
Flashpoint	435		
Water %		0.0		
Insolubles %	0.3


Oil Analysis Comments:
This sample shows a little extra nickel and silicon compared to universal averages but other metals are fine. Nickel may just be an alloy with steel, though iron isn't out of line at all, and silicon is likely just sealer material; it's fine. Looks pretty good from what we can see here! Try 40K miles or so.


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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 fluid/miles, 249K 00 Pontiac WS6 [Re: dhellman12] #4095826 05/13/16 01:59 PM
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I believe it has been changed at least once in its life. My rationale for this is typically most of the wear happens in the first 5-10K of an axle's life. For example, (granted it is a truck and a different OEM), but my 2010 FX4 had 429ppm of Fe at 13K, but at 70K it was 148ppm of Fe, and at 150K it was 120ppm of Fe. As you can see the ppm of Fe was the most early on and then decreased on a ppm per mile basis after that. At 250K, I would expect your Fe to be much higher than 294.


2019 Jeep Rubicon Wrangler Unlimited 3.6L V6 [OEM + Factory Fill]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum Euro 0W-40 & Mann filter]
Re: Unknown fluid/miles, 249K 00 Pontiac WS6 [Re: dhellman12] #4095833 05/13/16 02:04 PM
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69GTX Offline
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Iron seems high to me. It's the 2nd highest number. Not a very strong add package if you ask me. Nothing other than phosphorus. There are ATF's that have a better add pack.


----------------

2001 Lincoln Cont 4.6L DOHC/ 50K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Re: Unknown fluid/miles, 249K 00 Pontiac WS6 [Re: dhellman12] #4095838 05/13/16 02:09 PM
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Pontual Offline
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This is Diferential oil, not engine. No need for too much calcium, but need EP.

Re: Unknown fluid/miles, 249K 00 Pontiac WS6 [Re: 69GTX] #4095849 05/13/16 02:17 PM
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Originally Posted By: 69GTX
Iron seems high to me.
It is not high, in many ways it seems low for 250K miles or at the very least the OP has an excellent wearing axle on his hands if this is the original rear axle oil.


2019 Jeep Rubicon Wrangler Unlimited 3.6L V6 [OEM + Factory Fill]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum Euro 0W-40 & Mann filter]
Re: Unknown fluid/miles, 249K 00 Pontiac WS6 [Re: dhellman12] #4095888 05/13/16 02:42 PM
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AZjeff Offline
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Wondering how a fluid with unknown history can provide a baseline? How will you interpret this against a future UOA of known history?
Not dissing you, just curious.

Seems like with a 250K car you just change the diff fluid and forget about it..


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Re: Unknown fluid/miles, 249K 00 Pontiac WS6 [Re: AZjeff] #4106228 05/25/16 12:51 PM
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MolaKule Offline
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Originally Posted By: AZjeff
Wondering how a fluid with unknown history can provide a baseline? How will you interpret this against a future UOA of known history?
Not dissing you, just curious.

Seems like with a 250K car you just change the diff fluid and forget about it..


The only way to get a baseline is to do a VOA on the replacement fluid and sample fluid every 20k to see trending.

Last edited by MolaKule; 05/25/16 12:51 PM.

The value of a scientific theory is its ability to prompt further study, not that it has any relation to the established facts of scientific reality.
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