Honda 1995 Civic Owner's Manual page 125

Engine Oil
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).
Additives
Your Honda does not need any oil
additives. Purchasing additives for
the engine or transmission will not
increase your car's performance or
longevity. It only increases the cost
of operating your car.