A few years ago I watched a vid on a used E39 M5. It was pristine and the owner had all the receipts on maintenance/repairs. I think they said with those receipts he paid for the car twice. Lol.
2009 BMW 650 E64 with 4.8 liter engine. I run Castrol 5w40 in summer and Castrol 5w30 in winter. Both with LL01 approvals. Always in stock at the Oreiley’s down the street from me.