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I would think 10w50 would not be ideal for your situation. 120 deg C is not that hot and you are not keeping it up there for hours at a time. If you are NA I would run 5W30 and as stated above be careful until you oil gets to temperature (not coolant). My experience is, mine is turboed and I do run 0W40. Car does not get driven below freezing and our track days can be 32 degC plus. I am usually coming off the track after 20 min at 130 deg c or so.
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