Information On Acea Oil Grade; Information On Sae Oil Viscosity Classification - Vauxhall Corsa Owner's Manual

Information on ACEA oil grade

classification
The Association des Constructeurs
Européens d'Automobiles classifies engine
oils according to their performance
(quality).
Each class is identified by letters and
numbers, e.g. A3.
The letter indicates the field of application.
A = Petrol engines in passenger cars
B = Diesel engines in passenger cars
E = Diesel engines in trucks
The number indicates the grade in
ascending numerical order.
Important note
For countries in which the specified oils
(GM-LL-, ACEA A3/B3) are not available,
more detailed information is found in the
Service Booklet.
Information on SAE oil viscosity
classification
Engine and transmission oils are grouped
in SAE classes by the Society of Automotive
Engineers based on their viscosity.
Viscosity is the measure of internal friction
of the oil in flux, dependent on its
temperature.
The SAE classification does not provide
information on the quality of the oil; it
merely indicates the range of application
of the oil dependent on the outside
temperature – see diagram.
The first number indicates viscosity at low
temperatures (cold start behaviour). The
second number indicates viscosity at high
temperatures.
I = Only approved and recommended
long-life engine oils with the
identification GM-LL-A-025 or
GM-LL-B-025 – see page 215.
II = Only if the higher grade I is
unavailable may engine oils of oil
grade ACEA
be used.
This reduces the oil change
interval to 20,000 miles
(30,000 km) or 1 year –
see page 216.
217