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You should change your filter every 3,000 miles (or 5,000 km) whether it needs it or not.
The fact that you are running synthetic simply means the oil will not brake down as much with heat, will remain viscous at low temps....but it WILL get just as dirty as regular oil.
You should be able to keep the same oil for 6,000 miles...but please....CHANGE your filter every 3,000 miles.
Now, in New England it doesn't get "Canadian Cold." Ergo, you should be able to run regular 5W30 oil. If you compare the price of synthetic to regular, you will save money if you go to the regular oil.
Now, if you live where I live and it's regularly -30....consider synthetic. Or if you live in Arizona and "race" your vehicle....use synthetic. Or if you are willing to pay the "lazy-price" of not having to change the oil for twice the time-period...then by all means use synthetic.
Otherwise sir, use regular oil and change the whole works every 3,000 miles.
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