Pontiac 1955 Owner's Manual page 41

Short Drives in Cold Weather—Short drives in cold weather
(freezing temperatures or lower) such as city driving do not permit
the engine to warm up thoroughly, and water may accumulate in the
crankcase from condensation of moisture. Under these conditions it
may be advisable to change oil at 1,000-mile intervals.
High Mileage Driving—For the exceptional person who is operating
his car 500 to 1,000 miles per week consideration may be given to
greater mileage between oil changes. Oils have a tendency to thicken
on continuous high-speed driving. This should be kept in mind when
preparing cars for cold weather driving.
ADDING OIL BETWEEN CHANGES-Since the
lubrication system in a Pontiac is a full pressure
system, it is not necessary to keep oil level up to
the "FULL" mark on the dipstick. It is only neces
sary to keep oil level above the "ADD OIL" mark.
It takes two quarts to bring the oil level from
"ADD OIL" to "FULL" mark. Each time the gas
tank is filled, the oil level should be checked. How
ever, it is good economy to let the oil level approach
the "ADD OIL" mark before having your oil
changed.
CAUTION: Do not overfill.
1
5
z
g
z
2
<
5
I
T
0
TQTS
FULL FLOW OIL FILTER—The full flow oil
filter (optional at extra cost) is highly recommended
for use on the Pontiac Engine. This filter removes harmful particles
of dirt, grit or other foreign material before they can cause undue
engine wear by imbedding themselves m bearing surfaces or otherwise
harmfully affect engine performance.
The filter element should be replaced once yearly or 10,000 miles,
whichever occurs first.
38