Honda 1993 Civic Reference Owner's Manual page 103

Engine Oil
Recommended Oil
Oil is a major contributor to your
engine's performance and longevity.
Always use a premium-grade deter-
gent oil. You can determine an oil's
SAE viscosity and Service Classifi-
cation from the API Service label
on the oil container. It should look
like this:
Maintenance
The numbers in the middle tell you
the oil's SAE viscosity or weight.
Select the oil for your car accord-
ing to this chart:
Ambient Temperature
An oil with a viscosity of 5W-30 is
preferred for improved fuel econo-
my 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).
A fuel-efficient oil is recommended
for your Honda. This is shown on
the A P I Service label by the words
"Energy Conserving I I . " This oil is
formulated to help your engine use
less fuel.
The API Service label also tells you
the service classification of the oil.
Always use an oil that says "API
Service SG." This service rating
may also include other designations,
such as CD. These additional
classifications are not a problem, as
long as the label also carries the SG
classification. An oil that is only
classified SF is not recommended.
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.