Pontiac 1957 Owner's Manual page 34

The specific gravity of the battery should be checked regularly. The
battery should be kept at or near a full charge at all times (1.240-
1.280 hydrometer reading) . This is especially important in cold
weather when the demands on the battery are high. A battery can
freeze in extreme cold if it is not in a fully charged condition.
CAUTION: Battery fumes are inflammable and toxic.
To prolong the life of the battery it should be inspected for ev[(!ence of
corrosion, cleaned, flushed and dried at each lubrication period.
REAR SPRINGS-No lubrication required.
HYDRA-MA TIC TRANSMISSION - The Hydra-Matic fluid
level should be checked every 2,000 miles by the following procedure:
1. Apply hand brake tightly, move control lever to "P" position,
and run engine equivalent to 20 MPH for 1-1/ 2 minutes.
2. Reduce engine speed to slow idle. Remove oil level indicator,
wipe clean and reinsert.
3. Remove indicator again and note reading, if level is at lower
mark or below, add fluid to bring it to full mark.
DRAIN AND REFILL HYDRA-MATIC EVERY 25,000 MILES
Fluid Recommendations-When adding or refilling, use only GM
Hydra-Matic Fluid (available at all authorized Pontiac dealers), or
Automatic Transmission Fluid identified by an AQ-ATF qualification
number. (No special " additives to these fluids are required or recom-
mended.) Total drain and refill capacity is approximately 9 quarts
( 31)