Engine Oil Recommendations; Checking Oil Level; Supplemental Engine Oil Additives - Chevrolet Monte Carlo 1971 Owner's Manual

NOTE: If this cap requires a re-
placement, only a cap with these
same features should be used. Fail-
ure to use the correct cap can
result in a serious malfunction of
the system. Correct replacement
caps may be obtained from your
authorized Chevrolet Dealer.
Engine Oil
Recommendations
Use only engine oil which meets
oil quality standard GM 6041-M.
High quality oils which . are in-
tended for service MS and pass
car makers' tests are of this qual-
ity. The oil change interval (see
paragraph entitled "Engine Oil
Change Interval") and the new
vehicle warranty are based on the
use of oils that meet these require-
ments.
NOTE: Non-detergent and other
low quality oils are specifically not
recommended. The use of proper
engine oils and oil change inter-
vals are your best assurance of
continued reliability and perform-
ance from your Monte Carlo
engine.
Checking Oil Level
The engine oil should be main-
tained at proper level. The best
time to check it is before· operating
the engine or as the last step in
a fuel stop. This will allow the
oil accumulation in the engine to
drain back in the crankcase .. To
check the level, remove the oil
gauge rod (dip stick), wipe it
clean and reinsert it firmly for an
accurate reading. The oil gauge
rod is marked "FULL" and
"ADD." The oil level should be
maintained in the safety margin,
neither going above the "FULL"
57
line nor below the "ADD" line.
Reseat the gauge firmly after tak-
ing the reading.
NOTE: The oil gauge rod is
also marked "Use GM 6041-M
Quality MS Oil" as a reminder
to use only high quality oils as
prescribed under "Engine Oil
Recommendations. "
Supplemental Engine 011
Additives
The regular use of supplemental
additives is specifically not recom-
mended and will increase operat-
ing costs. However, in cases of
specific problems which may arise
under certain conditions, additive
supplements are available that can
effectively and economically solve
these problems without causing
other difficulties. For example, if
higher detergency is required to