1935 Cadillac - GM Heritage Center

the oil is consumed many times as rapidly as at city driving
speeds and oil must be added more frequently to maintain
the proper level.
Crankcase Ventilating System and Oil Screen
Cadillac engines are equipped with a crankcase ventilating
system to keep the oil in the best condition possible. The ventilating
system, which functions automatically, prevents dilution
and contamination of the oil by removing the vapors which seep
past the pistons.
A screen in the oil pan removes any solid matter from the oil.
The oil pan and screen should be removed and thoroughly washed
with gasoline every 12,000 miles to remove any carbon or foreign
particles that may have collected. In addition, the V-12 engine
is fitted with a self-cleaning oil filter which assures absolutely
clean oil for the overhead valve mechanism. It requires no attention
other than draining every 6000 miles, as described on page 47.
Changing Engine Oil
The useful life of the engine oil is greatly prolonged by the
Cadillac crankcase ventilating system, but the oil pan should be
drained and the engine oil replaced every 2000 miles. To drain
the oil, simply remove the drain plug (figures 6 and 7) and allow
the oil to flow into a receptacle placed under the car. The drain
plug should then be reinstalled and tightened securely before
pouring in fresh oil.
116]
CHAPTER III
Operation
/"\NE of the first things the driver should do is to familiarize
^-' himself with the location and use of the instruments and
controls described in this chapter.
Gasoline Gauge
The gauge marked "Gasoline'* indicates the quantity of fuel
in the tank at the rear of the car. This gauge operates electrically
and indicates the quantity
of fuel only when
the ignition is turned on.
When the tank is being
filled and the driver
wishes to check the
amount of fuel in the
tank, he should first
shut off the engine to
comply with filling
station regulations and
then switch on the ignition
SO that the gauge fig. s. General arrangement of the driving
will operate.
controls.
Oil Pressure Gauge
The oil pressure gauge indicates only the pressure under which
the oil is being forced to the engine bearings. It does not indicate
the quantity of oil in the engine. The gauge should indicate zero
as long as the engine is not running, but as soon as it is started
and as long as it runs, it should show pressure. If no pressure is
indicated when the engine is running, the engine should be
stopped at once. Serious damage may result if the engine is run
for any length of time whatever with no oil pressure.
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