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5.2.2

Heavy Duty Diesel Engines

E1 = Obsolete
E2 = Standard
E3 = Heavy conditions (Euro 1 -- Euro 2 engines)
E4 = Heavy conditions
(Euro 1 -- Euro 2 -- Euro 3 engines)
E5 = High performance in heavy conditions
(Euro 1 -- Euro 2 -- Euro 3 engines)

5.3 Lubrication System

Use oil that displays the American Petroleum Institute
(API) service doughnut symbol for diesel engines on the
container. Oils that identify this information meet U.S.
and international performance requirements set by the
engine manufacturers and lubricant industry including
the Society of Automotive Engineers (SAE).
Figure 5-1.
D
The top half of the doughnut identifies the oil
performance service level or the SAE viscosity
category. Use only the recommended API category C
for diesel-fueled engines.
D
The center of the doughnut identifies the SAE
recommended grade of oil.
D
The bottom half of the doughnut identifies the SAE
energy conservation category and may result in
overall fuel savings.
Note: Using unsuitable oil or neglecting an oil change
may result in engine damage that is not covered
by the engine warranty.
Note: DO NOT mix different oil brands. Incompatibility
could
cause
a
ingredients and reduce engine protection.
Reproduced courtesy of the American Petroleum Institute
1. Oil Performance Service Level or SAE Viscosity Category
2. SAE Viscosity Grade
3. Energy Conservation Category
Figure 5-1 API Service Symbol Doughnut
24
Section 5 General Maintenance
breakdown
of
lubricating
©
2007
1
2
3
5.3.1

Engine Oil Selections

Figure 5-2 shows additional information on which oil to
use according to air temperature when cold starting the
engine.
SAE viscosity
grade
SAE category
Figure 5-2 Engine Oil Selections
Figure 5-3 shows the recommended SAE viscosity
designation for a given operating temperature.
°
°
Oil: SAE...
F
C
See
122
50
104
40
85
30
68
20
50
10
32
0
14
10
--4
--20
--22
--30
--40
40
Figure 5-3 Viscosity Designation
5.3.2

Oil Check

Check the oil level before starting and after every
8--15 hours of usage. Use only an approved engine
diesel oil available at your authorized Kohler distributor/
dealer.
To avoid engine damage, it is important to follow these
instructions:
D
Check engine is horizontal and level.
D
Check the oil level before each startup.
D
Check the oil level daily after the warm (not too hot to
touch) engine is in the stopped position.
D
Check that oil level does not show a reading below
the ADD mark on oil dipstick or just below reservoir
FILL mark. See Figure 5-4.
10W40 or 15W40 for
5W40 for below
--18_C (0_F) or above
--18_C (0_F)
API classification
TP-6687
9/10