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248 Technical data
Under ACEA nomenclature, oils are divided into Class A for
gasoline engines and Class B for diesel-engined passenger
cars. There is a further class for heavy diesel engines. Each
class is divided into three grades: 1, 2 and 3, where grades 2
and 3 normally encompass semi and fully-synthetic oils. The
diesel class B also has a fourth grade, B4, which encompasses
tests and regulations aimed at improving the performance of
direct injection engines.
In the same way as in the API system, gasoline and diesel
engine specifications are combined for products that can be
used in both types of engine. For example, a grade designation
could be ACEA A2/B2 or ACEA A3/B3/B4.
To afford Saab engines the best protection, with regard to lubri-
cation, the ability to dissolve residues and the neutralization of
combustion products, we recommend the following oil grades:
API SH/CD/CF or SJ/CD/CF.
ACEA A3/B3/B4.
These oils contain the additives required for the engine to
function well. We advise against the use of further addi-
tives.
Viscosity:
The viscosity of oil is classified according to the SAE standard.
Nowadays, multigrade oils are always used in cars. The proper-
ties of these oils facilitate starting the car in cold weather but
mean that the oil is also viscous enough to coat all moving parts
under high pressures and with high outside air temperatures.
Multigrade oils are graded with two viscosities, e.g. 10W-30,
where the 10W meets certain viscosity requirements at -4°F
(-20°C), while the 30 fulfills requirements at a temperature of
212°F (100°C).
248


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