Sounds completely normal especially for B58/S58 since these engines are know to be on a "noisier" side at idle. Part of the reason is the clearance and second part is the oil. If you switch to Motul 5w40 (Like I have done for my S58 and track B58), the noise will go away mostly BUT I would not recommend doing that on a hybrid, a motor that potentially can be pushed while cold.
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