In response to the OP's question:
Yes: I firmly believe changing the oil every 3000-5000 miles is good practice. While in theory the molecules in synthetic "oils" never really wear out there are additives that do get used up and these additives are what make todays oils so superior from those of the past. I want them fresh.
I also think its good practice change your oil once a year regardless of mileage (just likey your manual says) because over time waxes and impurities can build in the oil, especially over the winter or in colder climates, stop and go driving, that cause thickening and can affect oils ability to flow and lubricate.
I myself use MB1 0-30 only because MB1 is what I've aways used and all three of my Hondas are/were clean as a whistle and running like new when they passed 200,000 miles, so I'm sticking with what I know...AND since common sense tells me most engine wear occurs at startup, before the engine oil is warmed to its operating viscosity and flowing properly, I want the oil that stays closest to that operating viscosity and thickens the least when its at ambient temp in the crankcase and filter. I choose the upper number based on what the manufacturer says is best viscosity for that engine and its lubrication system.
