08 GMC Acadia, 68k miles on factory fill

[jetman]

2008 GMC Acadia 2wd w/68,300 miles since new
Tranny = 6T75 used by GM and Ford
Trans fluid is the factory fill(Dextron VI ?)
The trans filter is internal and can not be changed unless the trans is removed and rebuilt.

Code:


IRON... 169

CHROMIUM.. 0

NICKEL.... 1

ALIMINUM.. 45

COPPER.... 235

LEAD... 0

TIN.... 11

CADMIUM... 0

SILVER.... 0

VANADIUM.. 0

SILICON... 8

SODIUM.... 11

POTASSIUM. 10

TITANIUM.. 0

MOLYBDENUM .0

ANTIMONY.. .0

MANGANESE. .33

LITHIUM.... 0

BORON.... 38

MAGNESIUM.. 4

CALCIUM.... 59

BARIUM.... 3

PHOSPHOROUS 154

ZINC.... 15



WATER....
VISCOSITY 100C.5.4

ACID#.... 1.24

OXIDATION... . 17

NITRATION.... 8


LAB COMMENTS: MANGANESE is at a MODERATE LEVEL; MANGANESE is most likely from a steel alloy; Clutch facing and/or bushing/thrust metal is at a MINOR LEVEL; Aluminum is at a MINOR LEVEL

Total trans capacity is 9.5 qts. I was able to changed/flush 3/4 of the old atf out and replaced it w/Amsoil.

 

[Brons2]

How does this compare to virgin Dex VI numbers? 5.4 viscosity seems low to me.

 

[dnewton3]

DEX VI is spec'd at 6.0 or so IIRC. Being a 2008, if it's factory fill, it's DEX VI.


Did you use Amsoil ATL or ATF?

 

[Brons2]

2.4PPM Fe per 1,000 miles, not bad.
3.45PPM Cu per 1,000 miles, a bit higher.
5.4 Vi vs 6.0 virgin, 10% shear.

What about TBN, is that relevant with ATF?

 

[jetman]

Originally Posted By: dnewton3
Did you use Amsoil ATL or ATF?


ATL atf(Amsoil low viscosity)

 

[dnewton3]

Excellent fluid. Now that the break-in metals are (mostly) gone, you'll likely have a very long lifecycle of this ATL fluid.