Found this on the Kendall site:
"Most people use a multi-graded oil that covers the highest and lowest
temperatures that will be encountered. This temperature change may be
seasonal or it can occur geographically such as during a winter trip
from the cold northern states to the warm South. Where these
temperature changes are experienced, the engine's viscosity
requirements are most generally covered by SAE 10W-30 or 10W-40 oils.
Where warmer average temperatures are the rule, SAE 20W-40 and 20W-50
will be the choice. In the colder areas, an SAE 5W-20 or 5W-30 may be
required. The general rule is to go no lower in SAE Grade, that is to
a thinner oil, than is required by the lowest temperature to be
encountered. Where extreme temperature variations are not expected,
the appropriate single graded oil may be chosen for reasons of economy."
And on Pennzoil's site:
"The two motor oil viscosity grades that are recommended by all
Japanese and American automobile manufacturers are SAE 5W-30 and SAE
10W-30. These are the only two viscosity grades that offer the proper
viscosity and flow characteristics for modern, high-tech engines.
Check your vehicle's owner's manual for specific recommendations on
oil type and required amount"
Regards,
Jim
B9470139
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