No, not unless you want to. The Honda dealer just uses a "bulk generic" oil. They don't even use Honda oil. Whatever they can purchase in 55 gallon drums for as cheap as they can purchase it, is what they buy.
Do use an original Honda filter though. It has an anti-drainback valve in it which keeps more oil in the motor to help prevent all the oil from going back into the oil pan when the motor is not running.
2006 honda odyssey engine oil drain plug torque
no synthetic, the clutch will slip.
5W20 Mobil
According to http://en.wikibooks.org/wiki/Automobile_Repair/Honda/Odyssey/Change_engine_oil_and_filter, you need 5 quarts of oil.
Absolutely! I converted to Mobil1 about 5 years ago.
Oil Change Time
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need to stop leak on 1995 Honda Odyssey on a oil pan gasket
SAE 5w20 conventional or synthetic any major brand.
The oil sending unit on a 1997 Honda Odyssey is directly above the oil filter. The oil filter is on the rear of the engine.
a illustation of odyssey 2006 engine