2005 Honda S2000 Owner's Manual - Page 135
2005 Honda S2000 Manual
Page 135 highlights
Differential Fluid FILLER BOLT Use an SAE 90 viscosity hypoid gear oil, API service classified GL5 or GL6 only. Put a new washer on the filler bolt, then reinstall the filler bolt. Tighten it securely. Tightening torque: 33 lbf·ft (45 N·m , 4.6 kgf·m) The differential should be drained and refilled with new fluid according to the time and distance recommendations in the maintenance schedule. If you are not sure how to check and add fluid, contact your dealer. CORRECT LEVEL Check the fluid level with the differential at normal operating temperature and the vehicle sitting on level ground. Remove the differential fluid filler bolt and washer, and carefully feel inside the bolt hole with your finger. The fluid level should be up to the edge of the bolt hole. If it is not, slowly add fluid until it starts to run out of the hole. 138