Generac Mobile MDE570P, Owner'S Manual, Page: 47 / 80

Owner’s Manual for Mobile Generator 43
API CK-4 and ACEA E9 oil categories have the following
chemical limits:
•
0.1% maximum sulfated ash
•
0.12% maximum phosphorous
•
0. 4% maximum sulfur
The chemical limits were developed to maintain the
expected life of the engine aftertreatment system. The
performance of the engine aftertreatment system can be
adversely affected if oil that is not specified in
Table 4-3
is used.
The life of your aftertreatment system is defined by the
accumulation of ash on the surface of the filter. Ash is the
inert part of the particulate matter. The system is
designed to collect this particulate matter. There is a
small percentage of particulate matter that is left behind
as the soot is burnt. This matter will eventually block the
filter, causing loss of performance and increased fuel
consumption. Most of the ash comes from the engine oil
which is gradually consumed during normal operation.
This ash passes through the exhaust. To meet the
designed life of the product, the use of the appropriate
engine oil is essential. The oil specification that is listed in
Table 4-3 has low ash content.
Maintenance intervals for engines that use biodiesel:
The oil change interval can be adversely affected by the
use of biodiesel. Use oil analysis to monitor the condition
of the engine oil. Use oil analysis also to determine the oil
change interval that is optimum.
IMPORTANT NOTE: DO NOT use API FA-4 oil in Per -
kins engines. API FA-4 oil is designed for use in
selected on-highway applications and is NOT
designed to support off-road applications, including
Perkins engines.
IMPORTANT NOTE: The following engine oils are
NOT approved by Perkins and must not be used: CC,
CD, CD-2, CF-4, CG-4, CH-4, and CI-4.
Lubricant Viscosity Recommendations for Direct
Injection (DI) Diesel Engines
The correct SAE viscosity grade of oil is determined by
the minimum ambient temperature during cold engine
start-up, and the maximum ambient temperature during
engine operation.
See
Figure 4-1 (minimum temperature) to determine the
required oil viscosity for starting a cold engine.
See
Figure 4-1
(maximum temperature) to select the oil
viscosity for engine operation at the highest ambient
temperature that is anticipated.
Generally, use the highest oil viscosity that is available to
meet the requirement for the temperature at start-up.
Figure 4-1. Lubricant Viscosities
NOTE: Supplemental heat is recommended for cold
soaked starts below 32 °F (0 °C). Cold soaked starts
occur when the engine has not been operated for a
period of time. This interval allows the oil to become
more viscous due to cooler ambient temperatures.
Aftermarket Oil Additives
Perkins does not recommend the use of aftermarket
additives in oil. Aftermarket additives are not necessary
to achieve the engines maximum service life or rated
performance. Fully formulated, finished oils consist of
base oils and of commercial additive packages. These
additive packages are blended into the base oils at
precise percentages to help provide finished oils with
performance characteristics that meet industry
standards.
There are no industry standard tests that evaluate the
performance or the compatibility of aftermarket additives
in finished oil. Aftermarket additives may not be
compatible with the finished oils additive package, which
could lower the performance of the finished oil. The
aftermarket additive could fail to mix with the finished oil.
This failure could produce sludge in the crankcase.
Perkins discourages the use of aftermarket additives in
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