10w40, 1.6 - 1.8 quarts. Synthetic is best because it doesn't degrade as fast, given the higher heat after riding from air cooled, and lack of oil filter. Unless, of course, you don't ride it often.
motorcycle
10w 40
10W30 or 10W40 motorcycle oil is recommended by Honda.
Read the user manual and concern your mechanic.
Brand NGK Type: CR5HSA just got some for mine
The 2009 Honda Accord has double overhead cam (DOHC).
The 2009 Honda Civic has single overhead cam (SOHC).
The 2009 Honda Pilot has single overhead cam (SOHC).
The 2009 Honda Ridgeline has single overhead cam (SOHC).
The 2009 Honda Odyssey has single overhead cam (SOHC).
The 2009 Honda Fit has single overhead cam (SOHC).
The recommended oil type for a 1987 Honda Rebel 250 CC is 10 W 40. This cycle oil can be purchased at any cycle shop or auto parts store.