Honda 1997 Odyssey Owner's Manual page 148

The oil container may also display
the API Certification mark shown
below. Make sure it says "For
Gasoline Engines."
API CERTIFICATION MARK
The SAE numbers tell you the oil's
viscosity or weight. Select the oil for
your car according to this chart.
Ambient Temperature
An oil with a viscosity of 5W-30 is
preferred for improved fuel economy
and year-round protection in your
Honda. You may use a 10W-30 oil if
the temperature in your area never
goes below 20°F ( — 7°C).
Engine Oil
Synthetic Oil
You may use a synthetic motor oil if
it meets the same requirements
given for conventional motor oil;
energy conserving, a service
classification of SH, and the proper
weight as shown on the chart. When
using synthetic oil, you must follow
the oil and filter change intervals
given in the maintenance schedule.
Maintenance