Hudson 1948 - 1952, Service Manual

Page: 19 / 333

LUBRICATION 1 - 9
cylinder engines. If the level happens to be low and the
speedometer indicates that the oil change period is near at
hand, it is more economical to have the oil changed at that
time.
WHEN TO CHANGE ENGINE OIL
The oil which is placed in the engine at the factory is sat-
isfactory for the first 500 miles of operation and should
then be changed.
Thereafter, at intervals of 2,000 miles, the oil pan should
be drained and refilled. If the car is operated in dusty areas
or for short distances at low speeds during cold weather,
foreign matter and sludge will accumulate and the oil
should be changed more frequently. However, the actual
change period is largely dependent on the individual driv-
ing circumstances.
The oil is drained by removing the plug at the rear of the
oil pan. To insure complete draining, it is important that
the operation be performed while the engine is warm.
Recommend to your customer that it is a good practice
to remove the oil pan at least twice a year, preferably in the
spring and fall to permit thorough cleaning of the screens
and pan.
CAUTION: The use of flushing oil or compounds is not
recommended. However, in the event they are used, it
will be necessary to remove the oil reservoir and thor-
oughly clean it out before Installing the new oil.
THE PROPER ENGINE OIL TO USE
The use of high-grade engine oil of the correct type is of
the greatest importance in obtaining maximum engine per-
formance. Always select oils from well-known and depend-
able brands, and of the proper viscosity to suit the seasonal
and customer driving requirements.
The oil refiners or marketers supplying engine oils are responsible for
the quality of their products and their reputation, is the car owners
best assurance of receiving high-grade lubricants.
TYPES OF OIL
The various types of oil marketed for engine lubrication
have been defined by the American Petroleum Institute as
follows:
REGULAR MOTOR OIL - This term is used to designate
a straight mineral oil. Oils of this type are generally suitable
under moderate driving conditions.
PREMIUM MOTOR OI L - This term is used to designate
an oil having proved oxidation, stability, and bearing corro-
sion preventative properties. Oils of this type are generally
suitable for use where operating conditions are such that
regular oils do not give satisfactory service.
HEAVY-DUTY MOTOR OIL
- This term is used to desig-
nate an oil having proved oxidation, stability, bearing corro-
sion preventative properties and detergent characteristics.
Oils of this type are generally suitable for use in both high-
speed diesel and gasoline engines under heavy-duty service
conditions.
It is most important that the oil should have the ability to
flow at low temperatures to permit easy starting, and at the
same time afford adequate lubrication when the engine is at
normal operating temperatures. The oil selected should be
based on its ability to perform these two functions at the
lowest anticipated temperatures expected before the next oil
change period. The illustration, Figure 3, will be helpful in
making this selection.
NOTE: Kerosene should be added only when temperatures
below -10° are expected for long periods.