3Com Gas Grill Caterpillar Commercial Diesel Engine User Manual

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9
Maintenance Section
Lubricant Specifications
Commercial Oils (3116 and 3126
Marine Engines)
The performance of commercial diesel engine
oil is based on American Petroleum Institute
(API) classifications. These API classifications are
developed in order to provide commercial lubricants
for a broad range of diesel engines that operate at
various conditions.
When a Caterpillar Special Application Engine Oil
(SAEO) is not used, use the following commercial
oils:
•
Single grade oil with a viscosity of SAE 30 or SAE
40 with an API CF-4 classification is preferred.
•
Single grade oil with a viscosity of SAE 30 or
SAE 40 with a CF-4 or CG-4 additive package
that does NOT contain viscosity improvers is an
acceptable oil.
For an acceptable commercial single grade oil,
contact your oil supplier or Caterpillar Customer
Service:
1-800-447-4986
The following explanation of the API CF-4
classification can be used to make the proper
choice when a commercial single grade oil with API
CF-4 classification is chosen.
API CF-4 – These oils service a wide variety of
modern diesel engines. API CF-4 oils provide more
stable oil control and reduced piston deposits in
comparison to API CF and the obsolete CE and CD
classifications of oil. API CF-4 oils provide improved
soot dispersancy in comparison to API CF and
obsolete CD oils. The API CF-4 classification was
developed with a 0.40 percent sulfur diesel fuel.
This represents the type of diesel fuels that are
commonly available worldwide.
Some commercial oils that meet the API CF-4
classifications may require reduced oil change
intervals. To determine the oil change interval,
closely monitor the condition of the oil and perform a
wear metal analysis. Caterpillar’sS·O·S oil analysis
program is the preferred method.
NOTICE
Failure to follow these oil recommendations can cause
shortened engine service life due to deposits and/or
excessive wear.
Total Base Number (TBN) and Fuel
Sulfur Levels for Direct Injection
(DI) Diesel Engines (3116 and 3126
Marine Engines)
The Total Base Number (TBN) for an oil depends
on the fuel sulfur level. For direct injection engines
that use distillate fuel, the minimum TBN must be 10
times the fuel sulfur level. The TBN is determined by
the “ASTM D2896” procedure. The minimum TBN
of the oil is 5 regardless of a low fuel sulfur level.
Illustration 3 demonstrates the TBN.
g00104890
Illustration 3
(Y) TBN by “ASTM D2896”
(X) Percentage of fuel sulfur by weight
(1) TBN of new oil
(2) Change the used oil when the TBN reaches this level.
Use the following guidelines for fuel sulfur levels
that exceed 1.5 percent:
•
Choose an oil with the highest TBN within the
API CF-4 classification.
•
Reduce the oil change interval. Base the oil
change interval on the oil analysis. Ensure that
the oil analysis includes the condition of the oil
and a wear metal analysis.
Excessive piston deposits can be produced by an
oil with a high TBN. These deposits can lead to a
loss of control of the oil consumption and to the
polishing of the cylinder bore.
NOTICE
Operating Direct Injected (DI) diesel engines with fuel
sulfur levels over 1.0 percent may require shortened
oil change intervals in order to help maintain adequate
wear protection.

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