Check on level ground from cold or warm.
Open oil filler cap and dip stick, wipe it and leave for 5 minutes, this allows any trapped oil due to natural vaccum inside the capillaries of the block to return to the sump. Dip the stick fully down until it makes the seal and pull back out.
Go off the lowest reading from either side of the gauge on the dip stick itself. There is exactly 1 litre of oil between the max and min mark (industry standard indication level).
So.... If it half way between at its lowest point, refill with half a litre.
Allow the oil to settle again a for a few minutes with both the cap and dip stick removed then repeat the measurement check.
Do not over fill.
If all is good refit the dip stick and filler cap.
With regards to the filler cap becoming gunked?
Remove the breather pipes from the top of the rocker covers and induction pipe connector completely from the car.
Spray brake and clutch cleaner down the rubber pipes to break down crusty, hardened oil deposits and use a pipe cleaner brush or similar until you can blow through them freely. Refit and enjoy an engine that is topped up and breathing correctly just as it should... Best of all, it's very cheap and easy to do and more importantly, helps prevent uneven idle issues due to breather blockages
For best results, combine it with a throttle body clean and reset procedure for good measure (do a search for a tutorial ) and you end up with a much better running engine with prevention being better than the cure
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