Synthetic Lubrication; Oil Viscosity - PREVOST H3-41 Maintenance Manual

SECTION 01 : ENGINE
FIGURE 7: D13 OIL FILTERS

2.5.4 Synthetic Lubrication

Synthetic oils are offered by some oil suppliers
as an alternative to the traditional, petroleum
based oils for engines. These oils may be used
in Volvo engines, provided they meet the quality
levels of the traditional, petroleum based oils for
engines and provided they meet the quality level
VDS-4 or VDS-4.5.
The use of synthetic oils does not permit the
extension of the recommended oil change
intervals.

2.5.5 Oil Viscosity

The viscosity grade defines the thickness of the
oil. The oil must be thin enough at low
temperatures for easy cold starts and thick
enough to protect at high temperatures. Oil is not
fully defined until both the API quality
classification and the viscosity grade are
specified.
Choose the viscosity grade for the typical
ambient temperature for the application.
Multigrade oils have a broad range that suit
operation in changing temperature.
Volvo North America recommends the
viscosities shown in the viscosity/temperature
table for Volvo engines.
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PA1621 Maintenance Manual All Series | Section 01 revised Feb 2019