you don't need to bother with sealing that one, it's very unlikely you'll have trouble with it. If you get an oil stain or something, mix lacquer thinner with diatomaceous earth and leave it on for 24 hours.
Use blue scotch bright pads in the sink and around the counter, not green. The green can dull the granite over time. it takes a while, but it can eventually happen.
If you're interested, i can send you a bottle of my cleaner. It's an all purpose, but safe for all stone. Works great for the entire kitchen. Just give me some feedback on it.