2006 Honda Ridgeline Owner's Manual - Page 241

Automatic Transmissison Fluid, Rear Differential Fluid 5. If the level is below the lower mark, remove the fill plug, and add fluid to bring it to the upper mark. Pour the fluid slowly and carefully so you do not spill any. Clean up any spill immediately; it could damage components in the engine compartment. Always use Honda ATF-Z1 (Automatic Transmission Fluid). If it's not available, you may use a DEXRON III automatic transmission fluid as a temporary replacement. However, continued use can affect the shift quality. Have the transmission flushed and refilled with Honda ATF-Z1 as soon as it is convenient. To thoroughly flush the transmission, the technician should drain and refill it with Honda ATF-Z1, then drive the vehicle for a short distance. Do this three times. Then drain and refill the transmission a final time. 6. Insert the dipstick all the way back in the transmission. The automatic transmission should be drained and refilled with new fluid when this service is indicated by a maintenance message on the information display. If you are not sure how to add fluid, contact your dealer. Rear Differential Fluid The rear differential should be drained and refilled with new fluid when this service is indicated by a maintenance message on the information display. This service may be needed more often under certain driving conditions (see page 232 ). Always use Honda VTM-4 Differential Fluid, and have your dealer replace the rear differential fluid. 242