Chevrolet Cruze Manual page 234

234 Service and maintenance
Engine oil
Engine oil is identified by its quality
and its viscosity. Quality is more
important than viscosity when
selecting which engine oil to use. The
oil quality ensures e.g. engine
cleanliness, wear protection and oil
aging control, whereas viscosity
grade gives information on the oil's
thickness over a temperature range.
Engine oil quality
dexos 1 All petrol engines.
dexos 2 All diesel engines.
ACEA A3/B3 Petrol engines (if
engine oil approved
ACEA A3/B4,
by dexos is not avail‐
ACEA C3,
able)
API SM,
API SN
Selecting the right engine oil
Selecting the right engine oil depends
on the proper oil specification and
viscosity grade.
Use and ask for engine oils with the
dexos certification mark. Oils meeting
the requirements of your vehicle
should have the dexos certification
mark on the container. This
certification mark indicates that the oil
has been approved to the dexos
specification.
Use only engine oil that is approved
to the dexos specification or an
equivalent engine oil of the
appropriate viscosity grade. Failure to
use the recommended engine oil or
equivalent can result in engine
damage not covered by the vehicle
warranty.
If you are unsure whether your oil is
approved to the dexos specification,
ask your service provider.
Use of substitute engine oils if dexos
is unavailable: In the event that dexos
approved engine oil is not available at
an oil change or for maintaining
proper oil level, you may use
substitute engine oil of the qualities
mentioned above. Use of oils that do
not meet the dexos specification,
however, may result in reduced
performance under certain
circumstances.
Topping up engine oil
Engine oils of different manufacturers
and brands can be mixed as long as
they comply with the required engine
oil (quality and viscosity).
If engine oil of the required quality is
not available, a maximum of 1 litre of
ACEA A3/B4 or A3/B3 grade may be
used (only once between each oil
change). The viscosity should be of
the correct rating.
Use of engine oil with only
ACEA A1/B1 or only A5/B5 quality is
prohibited, since it can cause long-
term engine damage under certain
operating conditions.
Engine oil additives
The use of engine oil additives could
cause damage and invalidate the
warranty.