Honda PRELUDE Owner's Manual page 138

Engine Oil
The SAE numbers tell you the oil's
viscosity or weight. Select the oil for
your car according to this chart.
(Except US: VTEC, Canada: SR-V)
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 below20°F(—7°C).
Maintenance
(US: VTEC, Canada: SR-V)
Ambient Temperature
An oil with a viscosity of 10W-30 is
preferred for improved fuel economy
and year-round protection in your
Honda. You may use a 5W-30 oil if
the climate in your area is within the
temperature range shown on the
chart.
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.