Opel Corsa Owner's Manual page 245

schedule
ACEA-A3: Petrol engines
ACEA-B4: Diesel engines without
diesel particulate filter
ACEA-C3 Diesel engines with
diesel particulate filter
Engine oil: top up
Oils from different manufacturers and
different brands of oil can be mixed as long
as the grades (quality and viscosity) are
the same.
Not all the engine oils available on the
market are of a suitable quality. Always
check that the required specification and
classification are given on the cans.
If engine oil of a suitable quality cannot be
obtained, use no more than 1 litre of
category ACEA A3/B4 or A3/B3 (once
between two oil changes). The viscosity
must be suitable for requirements.
It is forbidden to use engine oil of
grades ACEA A1/B1 and A5/B5. Under
certain circumstances, these oils can
cause long-term damage to the engine.
Opel Service, maintenance 239
Engine oil additives
The use of motor oil additives can lead to
damage and will invalidate the guarantee.
Engine oil viscosity
Only use engine oils with viscosity
grades 0W-30, 0W-40, 5W-30 or 5W-40.
The SAE viscosity grading system indicates
the oil's flowability. Oil is more viscous
when cold than when warm.
Multigrade oil has two numbers. The first,
followed by a W, indicates the viscosity at
low temperatures and the second indicates
the viscosity at high temperatures.
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