Bomag BW 211 D-4 Service Manual page 41

Fuels and lubricants
Oil viscosity
Multi-purpose oils should be generally used.
Since lubrication oil changes its viscosity with the tem-
perature, the ambient temperature at the operating lo-
cation of the engine is of utmost importance when
choosing the viscosity class (SAE-class) .
Optimal operating conditions can be achieved by us-
ing the opposite oil viscosity chart (Fig. 12) as a refer-
ence.
Occasionally falling short of the temperature limits will
impair the cold starting ability, but will not cause any
engine damage. In order to keep the occurring wear
as low as possible, occassional exceeding of the limits
should not happen over a longer period of time.
Fig. 12
With their better temperature and oxidation stability
synthetic lubrication oils offer quite a few benefits.
Oil change intervals
The longest permissible time a lubrication oil should
remain in an engine is 1 year. If the following oil
change intervals are not reached over a period of 1
year, the oil change should be performed at least once
per year, irrespective of the operating hours reached.
1
ACEA
E3-96/E5-02
E4-99 = 500 operating hours
1 European Engine Oil Sequences
008 911 45
2
API
CG-4/CH-4 = 500 operating hours
Caution
!
These intervals apply only when using a diesel
fuel with maximum 0.5 % sulphur by weight and
for ambient temperatures higher than -10 °C.
When using fuels with a sulphur content of more
than 0.5% to 1% or under ambient temperatures
below -10 °C the oil change intervals specified in
the table must be halved. For fuels with a sulphur
content of more than 1% you should consult the
responsible service agency.
Fuels
Quality
You should only use commercially available brand
diesel fuel with a sulphur content below 0.5% and en-
sure strict cleanliness when filling in. A higher sulphur
content has a negative effect on the oil change inter-
vals. Use only winter-grade diesel fuel under low am-
bient temperatures. The fuel level should always be
topped up in due time so that the fuel tank is never run
dry, as otherwise filter and injection lines need to be
bled.
When using fuels with a Cetan number < 49 poor
starting and white smoke can be expected, in particu-
lar in connection with low ambient temperatures.
The following fuel specifications are permitted: DIN/
EN 590; DIN 51 601; Nato Codes: F-54, F-75; BS
2869: A1 and A2; ASTM D 975-78: 1-D and 2-D.
DIN/EN 590
l
BS 2869
l
ASTM D 975-78: 1-D and 2-D.
l
Nato Codes: F-54, F-34, F44 und XF63
l
Winter fuel
Danger
!
Fire hazard!
Diesel fuels must never be mixed with gasoline.
For winter operation use only winter diesel fuel, to
avoid clogging because of paraffin separation. At very
low temperatures disturbing paraffin separation can
also be expected when using winter diesel fuel.
In most cases a sufficient cold resistance can also be
achieved by adding flow enhancing fuel additives.
Consult the engine manufacturer.
2 American Petroleum Institute
BOMAG
2.4
41