I'm not familiar with this oil but even if it has a great additive package I'm going to say it's too thick for your engine and usage. I also don't think 125C for oil temp is that hot.
I don't know if our engines are designed for such a heavy 10W50 oil.
Also, hard street driving is much different (easier on the car) than actual tracking. I personally use 0W30 and feel that is sufficient. I doubt you'll find many people using anything more than a 40 weight oil on the forums.
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