4 is fine for now, but I don't think will be enough. Start the car for a minute, get the oil circulating so it fills the new oil filter. Shut if off and measure with the dipstick after 5 mins. Top it up to suit.
The 2L is the engine capacity which is the size of the combustion cylinders. It affects torque and also partially affects power.
The 4L of oil is the sump capacity, which is the volume of oil that is required in the sump so that the oil pump can suck it up and distribute it throughout the engine for protection.
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