Checking Coolant Level - BMW 730i Owner's Handbook Manual

Coolant
Do not open up the cooling system while
the engine is hot, otherwise you may
scald yourself on the escaping coolant
Coolant consists of water and an antifreeze and
corrosion inhibitor additive. Not all commer-
cially available additives are suitable for your
BMW. BMW Service can provide details of
which additives are suitable.
Use only suitable additives, otherwise the
engine could incur damage. As these
additives are hazardous to health, observe the
notes on the containers.<
When disposing of coolant additives,
comply with the relevant environmental
protection regulations.<

Checking coolant level

1. Let the engine cool.
2. Turn the cap on the expansion tank slightly
anticlockwise until it starts to open, then
allow the pressure to escape before open-
ing it fully.
3. The coolant level is correct if it is between
the maximum and minimum marks in the
filler neck, see also diagram next to the filler
neck.
4. If necessary, slowly top up to the correct
level; do not overfill.
5. Turn the cap to close it, ensuring it is tight.
6. Have the cause of coolant loss rectified as
soon as possible.
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steam.<