The pump bearings need to be repacked after 200 hours the first time and less frequently once you get rid of the Honda Factory "Eco-Friendly" grease that came in it.
312 hours is not a lot if the oil is being changed at least every 50 hours.
Corrosion inside the engine bay/turbo area is the killer of most Hondas. it can be controlled with a frequent coating of CRC 656.
There are shop manuals that can be downloaded from the INET. Make sure they are 2004-2007 since the older models are different.
The rattling is from the necessay slack in the spline shaft, it does not hurt anything.
Enjoy your toy.
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