My GD3 has about 150k on it.

I switched to full synthetic(Royal Purple) at 100k. I change it every 7500ish miles.

I haven't had an issue with it. I use Honda OEM filters with the RP to ensure it's fine.
I did, however, run a engine sludge cleaner through before switching and haven't had an issue with it.

Works fine for me.

OP, Do what you feel is the best for your car.

 

I recently purchased a new 2013. Right from the factory it has 0-20w synthetic oil.
No break in oil. Must be good engines.

 

Aaaand how did you determine that?

 

Well you could have point there. I certainly didn't see them pour in synthetic or oil tested to see what is in there. It could be olive oil!
I have to rely on what Honda Dealer tells. Take that with a grain of salt, I suppose

But will be using the recommended 0-20W synthetic at my first oil change. I'm probably going to use Mobile 1, as I have some on hand. Guess what, I have no clue as to whether the Mobile 1 actually has the synthetic in that container labeled as Synthetic 0-20W.
I just have to assume that.

 

Top 7 Urban Legends About Motor Oil


5. When you buy a new car, change your oil at 3,000 miles to remove metal particles from the engine break-in process. There might be a grain of truth to this, according to the experts at Blackstone. Oil samples from engines during the first 3,000 miles of driving show elevated "wear-in" metal levels, coming from the pistons and camshafts, says Ryan Stark, Blackstone's president. But he added, "To me, it doesn't make that much difference because if the filings are big enough to cause damage, they will be taken out by the oil filter."

However, a Honda spokesman says its cars come from the factory with a special oil formulation for the break-in period. Honda advises owners to not change the oil early. Stark said Blackstone Laboratories' test of Honda's break-in oil shows it contains molybdenum-disulfide, an anti-wear additive. But Stark said Honda is the only manufacturer he knows that's using special break-in oil. The take-away? If there are any special break-in recommendations from the manufacturer, follow them. And consider analyzing the oil at 3,000 miles.