Per the Honda Service Manual: 4.2 US Qt without changing the filter and 4.5 US Qt. with filter change. Should be in the owner's manual too.
The maximum cargo capacity of the 2006 Honda Ridgeline is 8.5 cu.ft..
The maximum tosing capacity of the 2006 Honda Ridgeline is 5000 lbs..
The 2006 Honda Ridgeline has a V6 engine.
The 2006 Honda Ridgeline has 24 valves.
The 2006 Honda Ridgeline is a gas-powered vehicle.
The 2006 Honda Ridgeline has a 5-speed automatic.
The 2006 Honda Ridgeline is 17 ft. 2.9 in. (206.9 in.) long.
The 2006 Honda Ridgeline has a 22 degrees angle of departure.
The 2006 Honda Ridgeline has a 24.5 degrees angle of approach.
The 2006 Honda Ridgeline has single overhead cam (SOHC).
The 2006 Honda Ridgeline runs on regular unleaded.
The maximum payload of the 2006 Honda Ridgeline is 1549 lbs..