What do you use? Options

[turbohcar]

I know it's been talked about before, but I'd like to go a little more in-depth. Oil. Which grade to be more specific. I've read a couple VFAQs on it and had experience choosing oil (I change oil for a living at a Dodge dealership) for different vehicles. However, the only vehicle I am concerned about with this post is the 4G63T motor. Post what you use and why you use it. Like I said, brand isn't as important because most of the time it's a matter of opinion, it's more about the grade.
Right now I'm using Cenpeco 5w30. It's a paraffin wax based oil that is made for high performance vehicles. Pretty expensive but worth the price for an all race motor. I'll be switching to Valvoline Synthetic here the next oil change but I'm not sure yet which thickness. Thanks

[turbohcar]

I was thinking much the same thing. How heavy is too heavy, and how light is too light. In the hornet racecar we've used the Cenpeco and it's seems to do the best. Mainly because we run the car in between 6k and 8k the whole way around the track. Mostly at work, we put 5w30 in almost all newer cars/trucks. I want to go to Valvoline because I've always had good experiences with it and I'm afraid the paraffin wax may cause gunk buildup.