Holiday Navigator 2003 Owner's Manual page 422

Chassis Information
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A straight weight or monograde lubricating oil is not recommended.
Shortened drain intervals may be required as determined by a close monitoring
of the lubricating oil condition by means of an oil sampling program. The use
of oil analysis to extend drain interval is not recommended. There are numerous
variables which is the basis of the recommendation.
Synthetic oils API category III specifications are recommended for extreme
cold temperatures only. Low viscosity oils, used for winter operations, will aid
in starting. Synthetic oils, or oil with adequate low temperature properties used
for Arctic operations where the engine cannot be kept warm when shut down,
will aid in starting. The use of synthetic oils should not be used to extend drain
intervals. Extended oil change intervals can decrease engine life and possibly
affect the engine warranty.
Oil additives should not be used unless the oil supplier or oil manufacturer
has been consulted and provided positive evidence or data establishing
satisfactory performance in the engine.
NOTE: The engine does not require a "break-in" procedure.
Function of Engine Oil:
If a lubricating oil is to work in an engine it must be capable of performing
various functions. Lubrication of the moving parts is the primary function. The
lubricating oil should be able to form a film between metal surfaces preventing
metal to metal contact and reducing friction. When there is a metal to metal
contact, friction heat is generated. Welding of the part can occur and metal
transfer will result in scuffing or seizing. The film of oil contacting the surfaces
will provide cushioning and shock dampening as well.
Cleaning is another function. The oil should perform as a cleaner in the
engine by flushing contaminates from critical components. These contaminates
should be removed in the filtration system or during the course of an oil change.
Oil will provide a protective barrier to prevent corrosion of non-like metals.
Internal components of the engine require cooling. The primary coolant
system cannot provide this cooling. Oil will transfer heat by contacting the
various components then transferring to the primary cooling system at the oil
cooler. The uneven surfaces in the combustion chamber are filled to act as a
combustion seal within the cylinder liner and other internal components.
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