Coolant And Antifreeze - Opel Automobile Owner's Manual

11-6 Service and maintenance
Engine oil
Engine oil is identified by its quality
and also its viscosity. Quality is more
important than viscosity when
selecting which engine oil to use.
Engine oil quality
GM-LL-A-025: Petrol engines
GM-LL-B-025: Diesel engines
GM General Motors Europe
LL Longlife
A or B Engine oil quality
specification
025 Validity index
Opel engine oil meets classifications
GM-LL-A-025 and GM-LL-B-025 and
is therefore suitable for both petrol
and diesel engines.
Topping up engine oil
Oils of different manufacturers and
brands can be mixed as long as you
comply with the specified engine oil
criteria (quality and viscosity).
Not every engine oil available on the
market meets the quality
requirements, always check the
required specification and rating is
marked on the container.
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 ACEA A1/B1 and A5/B5
engine oil is expressly forbidden,
since they 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.
Engine oil viscosity
Diesel engines:
SAE 0W-30, 0W-40, 5W-30 or 5W-40
Petrol engines:
SAE 5W-30
The SAE viscosity rating defines the
ability of an oil to flow. When cold, oil
is more viscous than when hot.
Multigrade oil is indicated by two
figures. The first figure, followed by a
W, indicates low temperature
viscosity and the second figure the
high temperature viscosity.

Coolant and antifreeze

Use antifreeze of recommended
specification.
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