Yes, of course you can. You can even mix synthetic with conventional oil.
5W-30 Synthetic or Synthetic blend.
Yes!
5w-20. I recommend mobil1 synthetic oil.
Yes, Synthetic oil is synthetic oil no matter who makes it.
5w-30 or 10w-30 full synthetic oil.
3000 miles if using regular oil, 6000 if using synthetic. I use synthetic for my RSX-S, but regular would do for a base model.
Lucas also makes a synthetic engine oil additive.. Yes.
SAE 5w20 any major brand conventional or synthetic.
If You use regular oil very 3,000 miles with synthetic every 6,000 miles
You are going to want to get a full synthetic blend for your 2006 Acura RSX. They take a better oil in order to make the car last longer than a car that takes regular oil.
USE Synthetic ATV OIL, it comes in various weights. Valvoline makes it, but Lucus makes a good oil but it is 8 to 10 dollars a quart.