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I'm running OEM but next change I am going with Millers Nano CRX 75W90, but I have not yet so I can't give a first hand report on that. I put the OEM fill in 2014 and have maybe 50 track days on it, and plan to get a UOA when I change it. It hasn't given me any trouble with 20 minute sessions in summer, and sometimes I run 30+ in cooler weather if the car is staying cool.
These are my HPDE experiences and with stock.open diff.
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