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of sludge, varnish or bearing corrosion control when crank-
case oil temperatures are high.
"Service MS" and "Service DG" (Comparable to former
Heavy-Duty Types)-Oils having the characteristics to make
them generally suitable for use in internal combustion en-
gines operating under unfavorable or severe types of service
conditions.
For maximum engine protection under all driving condi-
tions, oils designated "For Service MS" or "For Service DG"
are recommended.
Oil Viscosity Numbers-SAE Viscosity Numbers indicate only
the viscosity or body of the oil, that is, whether an oil is a
light or a heavy body oil, and do not consider or include other
properties or quality factors.
The lower SAE Viscosity Numbers, such as SAE 5W and
SAE lOW which represent the light body oils, are recom-
mended for use during cold weather to provide easy starting
and instant lubrication. The higher SAE viscosity Numbers
such as SAE 20 and SAE 20W, which represent heavier body
oils, are recommended for use during warm or hot weather to
provide improved oil economy and adequate lubrication under
high operating temperatures.
Oils are available which are designed to combine the easy
starting characteristics of the lower SAE Viscosity Number
with the warm weather operating characteristics of the higher
SAE Viscosity Number. These are termed "multi-viscosity
oils;" SAE 5W-20, and SAE 10W-30.
The following chart will serve as a guide for the selection
of the correct SAE Viscosity Number for use under different
atmospheric
temp~rature
ranges, and suggests the appropriate
SAE Viscosity Numbers when multi-viscosity oils are used.
If the lowest antici-
pated temperature
during the interval
The following SAE
If
the Multi-Viscosity oils are
used,
in which the oil will
emain in the crank-
Viscosity Numbers are
the following grades are
case, is:
RECOMMENDED:
RECOMMENDED:
32°F
I
SAE 20W or SAE 20
I
SAE 10W-30
O°F
I
SAE lOW
I
SAE 10W-30
Below O°F
I
SAE5W
I
SAE 5W-20
NOTE: For sustained high speed driving, when the prevailing
daylight temperature is above goOF, S.A.E. 30 may be used •
• 73 •
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