Sufficient quantity of oil, correct oil-weight for the application, and "cleanliness" of oil are the most important factors - first & foremost! Use the maintenance-minder (MM) & mileage-ranges (3k miles, 5k miles, 7.5k miles, etc) as guides, but ultimately "look" at the oil & decide accordingly if it needs changed based on your driving-routine (short trips vs. long trips, lotsa stop-&-go vs. minimal accel/deccel), your environment (cold/hot, dusty & dirty), your vehicle's load (lotsa passengers/cargo, ascent/descent elevations, etc), and familiarize yourself w/ your air-filter every 5k or 7.5k miles (rather indicative how your oil is gonna "look").
As aforementioned, synthetic oils can help reduce
wear, help w/ fuel-economy, and extend your oil-change interval (when paired w/ a high quality oil-filter). But using a quality conventional oil that's regularly changed (and clean), correct weight & quantity, will do just fine!
A 5-quart jug of quality conventional oil is $15-$20 & requiring to be changed (generally speaking) at 3,750 - 5,000 miles, and a 5-quart jug of synthetic oil is $20-$25 & requiring to be changed (generally speaking) at 7,500 - 10,000 miles. It almost makes sense to do the latter, if driving conditions & factors aren't overly-demanding (in which case, shorter oil-change intervals matters more than conventional or synthetic).
Honda does not sell a synthetic, so why would you even consider it?
Ahem, ahem! :naughty:
http://www.bernardiparts.com/Honda-Motor-Oil-Synthetic__08798-9XXX.aspx
The 0W-20 Synthetic oil in Quart bottles is 08798-9036
The 5W-20 Synthetic oil in Quart bottles is 08798-9032
The 5W-30 Synthetic oil in Quart bottles is 08798-9034
The 0W-20 Full Synthetic oil in Quart bottles is 08798-9037
The 5W-20 Full Synthetic oil in Quart bottles is 08798-9038
The 5W-30 Full Synthetic oil in Quart bottles is 08798-9039
