Holiday Navigator 2003 Owner's Manual page 423

Synthetic Engine Oil:
In extreme environments, where ambient temperatures can be as low as
45º C (-50º F), a petroleum based oil will not perform satisfactorily in diesel
engines. Synthetic oils were developed for these type applications. These
synthetic oils are blend from ether and/or hydrocarbon based oils. These base
oils are produced by chemically reacting lower molecular weight materials to
manufacture lubricants of desired properties. All synthetic based oils must
meet the API category III classifications and SAE viscosity grades.
NOTE: Synthetic oils and petroleum based oils should never be
mixed.
Viscosity:
Viscosity is simply a measure of resistance of molecule layers moving
relative to an adjacent layer. All fluid viscosity is affected by temperature. A
multigrade lubricating oil tends to be less sensitive to temperature changes due
to formulation. Lubricating oils are generally selected for use with viscosities
appropriate for the expected operating temperature. The correct selection of a
lubricating oil of correct viscosity is critical for optimum performance. Some
effects of incorrect viscosity when the oil is too thick range from difficulty in
starting, to increasing fuel consumption and reduced power output. When the
oil is too thin, oil consumption is increased as well as wear from the metal to
metal contact. This will also increase engine noise.
Low temperature viscosity specifications are identified by a "W" (winter).
High temperature viscosity that meets the 100º C (212º F) requirements have
no suffix. When a lubricating oil meets both high and low temperature
requirements they are classified as multi-viscosity or multigrade.
Routine Maintenance Recommendations:
1. Check oil level daily.
2. Replace oil filter at every oil drain interval.
3. Cummins Engine Company, Inc. recommends the use of high quality,
API (American Petroleum Institute) licensed CH-4 or CES20071,
15W-40, multiviscosity oil or premium oil.
4. The recommended oil drain interval is defined by the API oil
performance classification and the engine duty cycle. Refer to the
Cummins Operation & Maintenance Manual for complete details.
NOTE: Engine oil levels above the dipstick full mark, or a
decrease in lube oil consumption, may indicate internal fuel
leaks into the crankcase. Check oil level frequently for fuel
contamination.
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