If your determined to use Dino just change it every couple thousand miles. I'd prolly swap out filter every 4K.
You could also change it once a month like RSD, or once a week or so like The Cheese...
But...BUT! *A good high quality Full Ester Synthetic will make your tranny feel like it just got a polishing job(Made a huge improvement in feel), your valvetrain will quiet down a little and I will swear that Silkolene Pro-4 10W-40 added a few ponies as well.
Weight wise stick to 10W-40. As far north as you are it's not going to really get hot enough for you to worry about using a higher weight, heavier oil and it is what Suzuki specifies...
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No man is so foolish but he may sometimes give another good counsel, and no man so wise that he may not easily err if he takes no other counsel than his own. He that is taught only by himself has a fool for a master.
Hunter S. Thompson
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