GM Diff oil UOA (Dexron LS Gear Oil?), 41K mi/67K km, Opel Insignia/Buick Regal

Joined
Dec 20, 2023
Messages
19
Location
Australia
2015 Opel Insignia (aka Buick Regal), same drive train as Saab 9-5 NG (2010-11)

1st drain, 41600 Miles/ 67000 km, GM OEM fill (Dexron LS gear oil 75w90), ~0.6L used
- replaced with Redline GL5 75w90, as recommended by Redline.

Rear Differential (NOT the haldex clutch thing, but the actual rear diff)

Wear + additives
PQ Index 12
Iron (Fe) 717 (!!!)
Chromium (Cr) 5
Nickel (Ni) 14
Copper (Cu) 24
Tin (Sn) 11
Lead (Pb) 5
Aluminium (Al) 22
Silicon (Si) 17
Sodium (Na) 32
Potassium (K) 15
Boron (B) 215
Molybdenum (Mo) <1
Zinc (Zn) 117
Magnesium (Mg) 7
Phosphorus (P) 2644
Calcium (Ca) 36
Lithium (Li) <1
Silver (Ag) <1
Barium (Ba) 2
Manganese (Mn) 9
Titanium (Ti) 1
Vanadium (V) <1
Cadmium (Cd) <1

Physicals
Water <0.1
Viscosity @ 40°C 82

Evaluation
Iron (ferrous/magnetic metallic particles) levels appear elevated and higher than expected for compartment. Results may be acceptable for run-in debris. All other results appear satisfactory, continue sampling at the normal rate
 
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