Damn...I never knew that. Guess I've been doing it wrong all these years. Thanks for the correction.
*EDIT*
I just looked it up in my manual.
Quote:
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Originally Posted by Audi Owner's Manual
Checking the engine oil level
The best time to check the engine oil level is when the oil is warm.
To get a true reading, the vehicle must be on level ground.
- After turning off the engine, wait a few minutes for the oil to return to the oil pan.
- Pull out dipstick (arrow) and wipe it clean with a rag.
- Reinsert dipstick; push it all the way in.
- Pull dipstick out again and read the level:
a - You must not add oil.
b - You can add oil. The oil level may go into the a range, but not above the a range
c - You must add oil. After fillin in oil, make sure that the oil level is somewhere within the b range.
- After checking the oil level, please make sure that the dipstick is pushed back in all the way.
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A refers to the high mark, b the middle range and c is the low mark.
I guess it must differ from manufacturers as I have been following this method since I've owned this car.