UOA, GM AF40-6 (Aisin tf80sc) ATF, 35K Mi

Joined
Dec 20, 2023
Messages
16
Location
Australia
2015 Opel Insignia (aka Buick Regal), same drive train as Saab 9-5 NG (2010-11)

the same tf80sc Aisin transmission thats used in a lot of other cars.

1st drain, 35k Miles, GM OEM fill, ~5.5L used (2x drains).

**personal note**
Yes it was pretty dark coming out.

GM did not give a service interval for the ATF... another "lifetime fill"... I'll change it every ~30k mi from now on.

Not a fan of GM's own AW1-spec ATF (not to mention GM doesnt have presense in Australia anymore), so used Valvoline Maxlife instead as the fill after the drain(s).

UOA:

Wear + additives
PQ Index 10
Iron (Fe) 65
Chromium (Cr) 1
Nickel (Ni) 2
Copper (Cu) 191
Tin (Sn) 9
Lead (Pb) Aluminium (Al) 25
Silicon (Si) 25
Sodium (Na) 8
Potassium (K) 13
Boron (B) 51
Molybdenum (Mo) Zinc (Zn) 12
Magnesium (Mg) 1
Phosphorus (P) 236
Calcium (Ca) 97
Lithium (Li) Silver (Ag) Barium (Ba) 2
Manganese (Mn) 2
Titanium (Ti) Vanadium (V) Cadmium (Cd)
Particles
ISO 3 Count 22/19/14
04 Microns 25096
06 Microns 3698
14 Microns 145
21 Microns 37

Oil condition
Nitration 5
Oxidation 40
Sulphation 31

Physicals
Water Viscosity @ 40°C: 27

Evaluation
Iron, copper and aluminium are noted but may be acceptable for the assumed run-in period - tin is also noted however at lowvalue - PQ is low and acceptable. Viscosity is consistent with Dexron -VI. No previous history limits accuracy of the trendmethodology however the values reported along with low PQ and ISO gives reason to consider the results acceptable.
 
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