grabbed my manual ('06 base 987, though the manual appears to cover the S, too; regarding oil there are no differences between base and S noted) --
"The difference between the minimum and maximum marks on the (oil level) segment display is approx. 1.2 litres.
Each segment of the display corresponds to approx. 0.4 litre."
re: topping off --
"Add at most half a litre of engine oil at a time."
for reference:
0.4 litre = 13.5 fl. oz / 0.423 quarts / 1.69 cups (just over one cup and two-thirds, which is what i would use).
1 litre = 1.06 quarts
more fun (so i can just look it up here rather than grabbing my manual):
oil change with filter = 7.75 litres (8.19 quarts)
oil change w/o filter (perish the thought of not throwing on a new filter!) = 7.5 litres (7.93 quarts)
oil!
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