I think it is up to your belief what works best.
I use Castrol Edge because the tuner recommended it. But I have used Castrol RS4T, cheap Hein Gericke and Louis (discount companies) oil, Motul... I change it regularly which I think is more important than having the most expensive oil you can buy. The expensive ones are said to have better additives, but the cheap stuff is not going to kill your engine imo.
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