What engine oil do you prefer,??.
Sure, you can call it BS, still won't help with your camshaft warranty claim. If I built an engine for you and supplied you with a break in oil and then you decided to use your own synthetic, and had a failure, then you wouldn't be getting a sympathetic ear from me.
Also, oil does more than just lube your engine, it's cleans it and helps absorb impurities from the cycling of the engine. That's why trying to stretch oil change mileage is not a great idea..
Just to add, didn't I see a post here where Lunati ( I think it was them) recommended not using synthetic oil with their cams until the engine had done around 50,000 miles? Or some bizarre mileage like that?