2004 Chevy 2500HD, 70k Amsoil ATF, 203K

[TXHunter]

Oil was changed at time of sample, although looks like it could have gone longer.

Make/Model: Allison 1000
Vehicle: 2004 Chevy 2500HD


Code:


OIL Amsoil ATF Amsoil ATF Amsoil ATF Allison Allison Allison ATF

MILES IN USE 70,037 60,568 50,547 55,999 45,909 22,681

MILES 203,351 193,882 183,861 133,314 123,224 99,996

SAMPLE TAKEN 3/14/17 6/22/16 10/7/15 12/8/12 6/13/12 7/19/11

MAKE UP OIL 0 1QT 0 0 0 0



ALUMINUM 11 10 11 13 11 9

CHROMIUM 0 0 0 0 0 0

IRON 36 31 36 34 28 23

COPPER 25 22 23 25 23 19

LEAD 24 23 26 42 37 34

TIN 0 0 0 0 0 2

MOLYBDENUM 0 0 0 0 0 0

NICKEL 0 0 0 1 1 0

MANGANESE 1 1 1 1 1 1

SILVER 0 0 0 1 0 0

TITANIUM 0 0 0 0 0 0

POTASSIUM 1 1 4 2 1 0

BORON 169 155 164 133 116 123

SILICON 7 6 7 5 4 3

SODIUM 6 7 6 6 4 5

CALCIUM 135 127 139 72 65 57

MAGNESIUM 1 1 1 2 1 1

PHOSPHORUS 411 398 412 349 310 298

ZINC 13 9 10 11 9 9

BARIUM 1 1 1 1 1 1



SUS @ 210 46.7 46.5 52.7 45.5 46.0 45.1

cSt @ 100 6.26 6.20 8.08 5.87 6.03 5.77

FLASHPOINT 435 425 405 410 375 390

WATER % 0.0 0.0 0.0 0.0 0.0 0.0

INSOLUBLES % TR TR 0.0 0.0 0.0 0.0

TAN 2.1 2.1 2.6 1.7 2.1


Blackstone Comments:
This is the same oil as last time, just with more use. As you can see, wear metals didn't bump up a whole lot since last time, so there's no sign of poorly wearing parts or mechanical issues for your Allison 1000. The viscosity was correct, and no coolant or moisture showed up. The TAN shows litle acidity at 2.1. Try 80K miles on the next fill and check back periodically to make sure everything remains in great shape. Excellent report!

 

[MolaKule]

Is this the Torque-Drive® (ATD) or the regular ATF?

 

[TXHunter]

This is the regular ATF.

 

[dnewton3]

Very consistent. Good performance.

Generally, the Alli 1000 series is about as easy on ATF as is the Dmax on oils. I've got a slew of Alli 1000 UOAs. These things generally wear very well, regardless what's in there, as long as it's a decent Dex/Merc type formulation. I've even seen good wear even when a conventional lube shears into the 4.x vis. Doesn't seem to phase the tranny at all. I'd say 100k miles is a no-brainer with any decent syn ATF in these units.

 

[zeng]

Where could be the source of Pb ?

 

[MolaKule]

Originally Posted By: zeng
Where could be the source of Pb ?


My guess is a carrier bearing, often made of a copper-lead-zinc alloy.

Hint, see the copper ppm levels?

 

[dnewton3]

Originally Posted By: MolaKule
Originally Posted By: zeng
Where could be the source of Pb ?


My guess is a carrier bearing, often made of a copper-lead-zinc alloy.

Hint, see the copper ppm levels?



Agreed.

Very consistent wear rates on those metals from this truck. If this is "failing", it's doing so in a very predictable, controlled manner. That seems unlkely, as when something fails, there is often an escalation of metals shed. More likely this is just typical wear data. And I have info to back this up:

Using a DEX VI product, with an average of 33k miles use, the avg Cu is 44ppm and avg Pb is 10ppm, with fairly wide stdev of 10+. (data from 40 different trucks of varying age)
Using a Dex/Merc product, with average of 34k miles use, the avg Cu is 38ppm and avg Pb is 24ppm, with the same 10+ stdev. (data from 35 different trucks of varying age).
Zn is about equal on both products; about 20ppm +/- 10.


Or simply put, these Alli 1000 trannies shed a fair amount of Cu, Pb and Zn.

 

[TXHunter]

For what it's worth, the universal averages that Blackstone is showing for the Allison 1000 on 47,400 miles has Copper at 39, and Lead at 19...

 

[dnewton3]

I get my data for this application from Blackstone. The numbers will always change a bit, given the ups/downs of market preferences.
Hence, why it's important to know standard deviation. Knowing an average (mean) is only 1/2 of the answer ...


I have a lot of UOAs from these units. I can tell you that each individual unit seems to have it's own unique wear characteristics, and it rarely is affected by lube selection or duration of use. They will tend to establish a wear rate and settle down and perform in that manner for their lifetime. At some point, a failure may occur, but infrequent UOAs are not going to pick this up, because once a failure mode starts, it escalates far quicker than any 20k mile UOA is going to find. By the time the issue becomes audible/sensible, it's already too late. The only thing we can say at this point about your trans is that it's performing at a very consistent state with no statistical indication anything is afoot.