BMW 318i Owner's Handbook Manual page 126

Do not add oil beyond the upper dipstick
mark. Adding too much oil will harm the
engine.<
Petrol engine: checking engine oil level
Your car is equipped with an electronic oil-level
monitor.
For a precise measurement and display of the
oil level, it is necessary that the engine be at
operating temperature, i.e. after uninterrupted
driving for at least 10 km or 6.5 miles. You can
have the oil level displayed while you are driv-
ing, or while the vehicle is at a standstill on a
level surface and the engine is running.
You can have the oil level reading displayed in
the instrument cluster.
1. Push button 1 in the turn indicator lever up
or down repeatedly until the appropriate
symbol and "OIL" are shown in the display.
2. Press button 2 in the turn indicator lever.
The oil level is checked and the reading dis-
played.
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Possible displays
1 Oil level OK
2 Oil level is being checked.
This can take about 3 minutes if the car is at
a standstill on a level surface, or about
5 minutes while the car is on the move.
3 Oil level down to minimum:
Add engine oil at the earliest opportunity,
but no more than 1 litre, approx. 1.8 Imp pt.,
see also Adding engine oil on page 125.
4 Oil level too high.
Adding too much oil will harm the
engine. Have the vehicle checked
without delay.<
5 The oil level sensor is defective.
Do not add engine oil. You can continue
your journey. Note the newly calculated dis-
tance remaining to the next oil service, see
page 127. Have the system checked as
soon as possible.