2001 Grand Prix, M1 ATF UOA

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Grand Rapids, MI
2001 4 Door Grand Prix GT, 3800 V6 with 4T65E trans.

Trans History:
May 2001: Purchased new
12/06/2003, 30,026 miles: Dropped the pan, changed the filter, refilled with 7.5 qts of Mobil 1 ATF
3/25/2006 60,800 miles: Added a ATF cooler
3/26/2006 60,820 miles: Dropped the pan, changed the filter, refilled with 7.5 qts of Mobil 1 ATF

8/23/2008, 90,690 miles: Dropped the pan, changed the filter, flushed with 2.5 qts of leftover Mobil 1 ATF (DexIIIh) and 12+ qts of GM Vehicle Care Dex VI.

Blackstone's Comments: Universal averages show typical wear levels from this type of tranny after routine ATF use. This fluid was run significantly longer than that, and yet, wear displayed here is generally lower - a victorious combination. The TAN read 1.0. This is reasonably non-acidic, although a minute amount of acid is present. If that's palatable to you, no worries mate. A trace of insoluble material was found, which is perfectly acceptable. A picture of health here - nice transmission.

Current Sample / Universal AVerages
ALUMINUM 4 / 14
CHROMIUM 0 / 0
IRON 79 / 139
COPPER 113 / 113
LEAD 58 / 88
TIN 4 / 5
MOLYBDENUM 0 / 1
NICKEL 1 / 1
MANGANESE 1 / 2
SILVER 0 / 0
TITANIUM 0 / 1
POTASSIUM 2 / 1
BORON 83 / 72
SILICON 5 / 27
SODIUM 9 / 12
CALCIUM 132 / 130
MAGNESIUM 3 / 11
PHOSPHORUS 382 / 271
ZINC 11 / 88
BARIUM 0 / 5


SUS VIS 210ºF 45.0
cSt @ 100ºC 5.72
FLASHPOINT ºF 405
WATER 0.0
INSOLUBLES TR
TAN 1.0

Seems to look OK. I did a flush this time but any reason I can't go back to 30k pan drops which is what this represents? Comments welcome.
 
It sheared down some. I believe M1 starts at 7.5 cst.
I've seen similar viscosity drop in Amsoil ATF. Sometimes I wonder if synthetic ATFs are really any better.
How does your car like Dex VI?
 
Last edited:
Originally Posted By: friendly_jacek
How does your car like Dex VI?


I've got it in both my cars now and I can't tell a difference in mileage or feel. I can't complain since both transmissions seem to work well.

Maybe I should go 30k miles and just sample it?
 
I have always been pleased with Amsoil in Toyota T-IV applications.

That in mind, T-IV seems to be one lousy ATF to begin with.
 
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