The brakes squeaking aren't uncommon and as per this
thread appear to be covered by a 'silent' recall.
Buy the oil
online?
I don't know much about oil, but have been reading online and it seems that the 0W is better suited for the colder climates. Since it is thinner, wont you be sacrificing long term protection of your engine?
My car has 2500 miles, so I haven't brought it in yet, but I'll probably look for a place that has 0W going into the winter months and 5W going into the warmer months. Again, I'm not an expert, but just a guy whose been doing some online reading. (
Engine Oil Bible and this
thread)