2003 Honda S2000 Owner's Manual - Page 159

Engine Oil The oil's viscosity or weight is provided on the container's label. Select the oil for your car according to this chart. Synthetic Oil You may use a synthetic motor oil if it meets the same requirements given for a conventional motor oil: it displays the API Certification Seal, and it is 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. Additives Your Honda does not require any oil additives. Additives may adversely affect your engine's or transmission's performance and durability. Ambient Temperature An oil with a viscosity of 10W-30 is preferred for optimum fuel economy and year-round protection in your Honda. You may use a 5W-40 oil if the temperature in your area goes below 0°F ( 20°C). 162 Maintenance