10W30 should be a good start. If you live in a warmer climate, 10w40 isn't a bad choice. You'll need 5 or 6 quarts depending on the capacity of your oil filter.
10W30 would be recommended.
SAE 10w30.
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Use any name brand gasoline treatment then top off with fresh gasoline and you'll be fine.
4 quarts
5W30 oil.
5w30
Use any major brand 5W20 oil.
5W30 oil. Gastrol GTX, Kendal,
10w30 unless it is burning oil, in that case use 10w40.
4