My '05 had 23 miles on it when I drove it off the lot. See my thread about LS-2 engine break in.
I changed oil at 624 after the break-in cycle I noted.
Immediately improved mileage, engine breathing and sound.
I've had guys tell me it's a waste to change oil more frequently than specs. I completely disagree.
It's a fact that the newer, cleaner and fresher the oil is, the better for the engine. That is indisputable.
While changing the oil every one hundred miles might be extreme -- unless you were doing extreme driving -- the factory recs are a balance of consumer economy, consumer laziness, and engine life... and are made with a conservative eco-mileage-based driving style figured in some lab.... not in real-life driving.
So... my rec is, if you're gonna smack your Goat in the a$$, you better change that oil more often than factory.
Clean oil, clean air, good cooling, good gas... the four bedrock fundamentals upon which ANY engine's performance is built, regardless of what else is done to her.