8.2 Fuels and lubricants
8.2.1 Engine oil
8.2.1.1
Oil quality
The oil is an essential factor for the performance and lifetime of the
engine.
Use engine oil for four-stroke engines which meets or even
exceeds the requirements for API-classification SJ or higher.
8.2.1.2
Oil viscosity
Since lubrication oil changes its viscosity with the temperature, the
ambient temperature at the operating location of the engine is of
utmost importance when choosing the viscosity class (SAE-class).
Temperature related lubrication oil changes can be avoided by
using multi-purpose oils. The following oil change intervals apply
also when using multi-purpose oils.
SAE 10W-30 is recommended for general use. Other viscosities
from the illustration can be used as long as the average tempera-
tures iat the place of use stay within the specified limits.
You may alternatively use 15W-40 (except under low tempera-
tures).
8.2.1.3
Oil change intervals
Oil change interval for API SJ: every half year or every 100 oper-
ating hours.
8.2.2 Fuel
8.2.2.1
Fuel quality
Use unleaded gasoline with a research octane number of 91 or
higher (or octane number 86 or higher).
Use unleaded standard grade gasoline with maximum 10 percent
by volume of ethanol (E10) or maximum 5 percent by volume of
methanol.
Methanol must also contain co-solvents and corrosion inhibitors.
Do not use any fuel with a higher ethanol or methanol content.
The use of fuels with a higher ethanol or methanol content will
cause starting and/or power problems or even cause damage in
the fuel system.
Fig. 46
Maintenance – Fuels and lubricants
BP 25/50
65
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