Maintenance
BOMAG
35
BPR 25/40, BPR 25/50
5.2
Fuels and lubricants
Engine oil
Use winter grade engine oil for winter operation!
In order to assure perfect cold starting it is import
to chose the viscosity (SAE-class) of the engine oil
according to the ambient temperature.
For winter operation below -10 °C the oil change
intervals must be shortened.
Fig. 33
Lubrication oil with a too high viscosity index caus-
es starting difficulties, the temperature when start-
ing the engine is therefore of highest importance
when choosing the viscosity of engine oil for winter
operation.
Oil viscosity
Since lubrication oil changes its viscosity with the
temperature, the ambient temperature at the oper-
ating location of the engine is of utmost impor-
tance when choosing the viscosity class (SAE-
class) (see diagram).
SAE10W-30 is recommended for general use un-
der any temperature. When using single purpose
oil you must choose the correct viscosity for the
area of use.
Occasional falling short of the temperature limit
(e.g. use of SAE 15W/40 down to -15 °C) may ef-
fect the cold starting ability of the engine, but will
not cause any engine damage.
Temperature related lubrication oil changes can
be avoided by using multi-purpose oils. The follow-
ing oil change intervals apply also when using mul-
ti-purpose oils.
Oil quality
You should preferably use oils of API-quality class
SF or SG, SHPD oils or CCMC-D4-D5-PD2 oils.
The API-classification is used to classify the oil
quality.
The oil manufacturer is solely responsible for as-
signing a product to a certain quality class.
i
Note
When changing to a higher alloyed oil quality after
a longer period of operation, it is recommended to
perform the first oil change of the higher quality oil
already after 25 operating hours.
Oil change intervals
The longest permissible time the lubrication oil
should remain in an engine is 1/2 year or 100 op-
erating hours.
Fuel
Quality
Use automobile gasoline (preferably unleaded fuel
or fuel with a low lead content, in order to reduce
the combustion residues to a minimum).
Do not use oil-gasoline mixes or contaminated
gasoline. Protect the fuel tank against dirt, dust or
water.
Alcohol containing gasoline
If you decide on using alcohol containing gasoline
(Gasohol), you should make sure that the octane
number is at least as high as for unleaded gaso-
line.
There are two types of "Gasohol" available: the
one type contains ethanol, the other one contains
methanol. Do not use "Gasohol" with more than
10% ethanol. Do not use any gasoline with ad-
mixed methanol (methyl or methyl alcohol), which
does not contain solvents or corrosion protection
for methanol. Do not use gasoline with more than
5% methanol, even if it contains solvents and cor-
rosion protection agents.
Mineral oil based hydraulic oil
The hydraulic system is operated with hydraulic oil
HV 32 (ISO) with a kinematic viscosity of
32 mm
2
/s at 40°C. For topping up or for oil chang-
es use only high-quality hydraulic oil, type HVLP
according to DIN 51524, part 3, or hydraulic oils
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