Just a few thoughts -
Race cars use racing
oil because it's only going a few hundred miles and all they want is pure lubrication. Tomorrow they'll tear down the engine and clean it up. They use higher viscosity because they're running at 7,000 RPM all day long! Don't base your
oil selection on what Rusty Wallace uses.
Both
synthetic and mineral
oil will adequately lubricate any street engine for many, many, many miles.
You should use the thinest oil possible while maintaining the pressure you need. If 5W-30 gives enough pressure use it, if not use a higher viscosity.
Change the oil and filter regularly, use good quality for both.
Don't install an empty filter, fill it first then install.
Regardless of the mileage change the oil at least once a year. Don't dump the old oil into the woods or a storm sewer!
Be wary of additives. It could be that Castrol, Quaker State, Pennsoil and Mobil already know how to best lubricate your engine.
Avoid high revs 3 seconds after your engine starts. Let the oil move around and warm up.
Don't always believe your engine builder or mechanic. Many of them would still go back to 6 volt electrical systems, vacuum wipers, tube radios, generators, drum brakes, bias tires and inner tubes. I'll bet many of them don't have cable TV or a PC.
Bob