Vauxhall VECTRA Owner's Manual page 283

Inform ation on AC EA oil grade
cla ssific ation
The Association d es Constructeurs
Européens d'Automobiles classifies engine
oils according to their perform anc e
(quality).
Ea ch class is identified by letters and
numbers, e.g. A3:
The letter indicates the field of application:
A = Petrol eng ines in passenger cars
B = Diesel engines in passenger cars
E = Diesel engines in trucks
The number indicates the quality in
ascending numeric al order.
Im portant note
If the aforementioned oils (GM-LL-, ACEA
A3/B3) are not a vailable in your country,
see more detailed inform ation in the
Service Booklet.
Informat ion on SAE oil vi sc osit y
Engine a nd transmission oils are grouped
in SAE classes b y the S oc iety of Automotive
Engineers b ased on their v iscosity.
Viscosity is the measure of interna l 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 v iscosity at low
temperatures (cold sta rt behaviour). The
second num ber indicates visc osity a t hig h
temperatures.
I = O nly approved and recommended
Long -Life engine oils with the
identification GM-LL-A-025
or GM-LL-B -025 – see page 279.
I I = O nly if the higher quality I is
unavailablemay engine oils of ACEA
oil qualitybe used in this case the oil
change interval is reduced to
20, 000 miles (30, 000 km) or 1 y ear –
see page 280.
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