'13 CTS-V Fuchs Sintopoid 75W90, 15k miOCI, 76k mi

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All mileage is in kilometers not miles. The previous fill was: Red Line 75W90.

Notes from slip: Street plus 48 hours on track. Only had Fuchs last change instead of Red Line, so used that. I hope that did not make this UOA pointless. This is first with diff cooler to reduce heat.

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I think this lube is worse than what I had before. It's the diff cooler. It's been running constantly at track events.
 
OP, please explain your fluid history. The Oct 2016 and Nov 2016 numbers show a wild variation in viscosity and additive package compared to the others. 48 hours of track time? You were bending it over! IMO, the Fuchs was serving you well.

Scott
 
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