Owner's Manual for the vehicle. With a quick reference ... - E38.org

146nCoolant
Do not add coolant to the cooling
system when the engine is hot.
Escaping coolant can cause burns.
To avoid the possibility of damage later
on, never use anything other than factory-approved,
nitrite and amino-free
extended-duty antifreeze with corrosion
protectant. Your authorized BMW center
is familiar with the official specifications.
Antifreeze and anti-corrosion agents
are hazardous to health. Store antifreeze
and anti-corrosion agents in their
original containers where they are inaccessible
to children.
Extended-duty antifreeze with corrosion
inhibitor contains ethylene glycol - a
flammable substance. For this reason,
do not spill antifreeze with corrosion inhibitor
on hot engine components. It
could catch fire and cause serious
burns.<
380de081
Correct coolant level when the engine
is cold (approx. 687/206):
Unscrew the cap from the expansion
tank.
The coolant level is correct when the
end of the red float is aligned with the
upper edge of the filler opening (refer to
the arrow in the illustration or the schematic
diagram next to the cap).
The coolant is a mixture of water and
extended-duty antifreeze with corrosion
inhibitor. Always maintain the prescribed
all-season 50:50 mixture ratio
for year-round protection against internal
corrosion. No other additives are required.
Replace the coolant every four years.
To add coolant
Wait until the engine cools before removing
the cap from the expansion
tank. The needle of the coolant temperature
gauge in the instrument cluster
must be located in the blue zone; otherwise,
there is a danger of scalding.
1 Start by turning the cap counterclockwise.
Pause to allow any accumulated
pressure to escape, then remove
the cap
2 If the coolant is low, slowly add coolant
until the correct level is reached –
do not overfill.
Comply with the applicable environmental
laws regulating the disposal
of extended-duty antifreeze with
corrosion inhibitor.