@OP
You might consider this one, I think it's easily available in Belgium :
Total Quartz 9000 Energy 5w40
https://oil-club.de/index.php?thread/1454-total-quartz-9000-energy-5w-40/
It's a stout classic Full SAPS 5w40, with enough ZDDP, high 100°C viscosity, good CCS, TBN and Noack, top specs (MB229.5 and Porsche A40)
You might consider this one, I think it's easily available in Belgium :
Total Quartz 9000 Energy 5w40
https://oil-club.de/index.php?thread/1454-total-quartz-9000-energy-5w-40/
It's a stout classic Full SAPS 5w40, with enough ZDDP, high 100°C viscosity, good CCS, TBN and Noack, top specs (MB229.5 and Porsche A40)