SECTION 2 – REQUIREMENTS FOR FUEL, ENGINE O IL, AND COOLANT
Engine Oil (cont.)
SAE OIL VISCOSITY GRADES AND TEMPERATURE
RANGES
Figure 1 0 SAE oil viscosity grades and temperature
ranges
The Society of Automotive Engineers (SAE) defines oil viscosity
(thickness) by grade. Colder temperatures require lower grade
oils for correct flow during starting. Higher temperatures require
higher grade oils for satisfactory lubrication.
• An oil pan and block coolant heater is required for
temperatures below -12 °C (10 °F).
• For heavy duty driving or trailer towing, higher oil grades
15W-40 and 5W-40 oils are required, if temperatures are
over 10 °C (50 °F).
Form No. 1172040R1
Printed in the United States of America Page 33
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