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For fast road and track I always use Valvoline VR1 5w50 in a F4R.
After looking at many different oils in 5w40 through to 10w60, it had the best range of kinematic viscosity from low to high temp.
I found it performed well in both high revving N/A engines and boosted engines too.
One of my old Clios rusted from the inside out.
From the outside it wasn't too bad. On removal of the rear 1/4 panel trims the diagnosis was terminal.
So just keep that in mind that it can look ok, but could be a complete shed.
I have all the panels available, I'll have to check if they've been fitted before or not. I know the bonnet hasn't but I'm not sure on the doors and boot.