Looks like it's around 3 litres left in the sump then, when 'off the dipstick', if adding 1.5l took it above the max.
Be careful doing that. At least a litre will be in circulation around the engine when it's running, filling the filter canister, the VVT adjuster, the tappets, the turbo, etc etc which leaves even less in the sump for harder cornering. Easy to run a big end dry.
Check your oil more frequently.