Coolant – BMW 335i Convertible 2010 User Manual

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The engine oil quality is critical for the life of the
engine.
Only use approved High Performance oil.
Approved oils belong to the following viscosity
classes: SAE 0W-40, SAE 0W-30, SAE 5W-40
and SAE 5W-30.

Alternative oil types

If the approved engine oils are not available, up
to 1 US quart/1 liter of another oil with the fol-
lowing specification may be used:
API SM or higher

Coolant

Do not add coolant to the cooling system
when the engine is hot. Escaping coolant

can cause burns.

Coolant consists of half water and half additive.
Not all commercially available additives are suit-
able for your BMW. Ask your BMW center for
suitable additives.

Only use suitable additives; otherwise,
engine damage may result. Because

additives are harmful to your health, it is impor-
tant to follow the instructions on the contain-
ers.

Comply with the appropriate environ-
mental protection regulations when dis-

posing of coolant additives.

Checking coolant level

Do not open the engine hood before the
engine has cooled down.

Turn the cap of the expansion tank a little
counterclockwise to allow any accumulated
pressure to escape, then continue turning
to open.

The coolant level is correct if it is between
the maximum and minimum marks in the

filler neck, refer also to the diagram next to
the filler neck.

If the coolant is low, slowly add coolant up to
the specified level; do not overfill.

Turn the cap until there is an audible click.

Have the reason for the coolant loss elimi-
nated as soon as possible.