When should I get my oil analyzed?

Hey everyone,So I've been wanting to do an oil analysis through Blackstone labs for a while, but my most recent oil change, I wasn't sure of the exact mileage, and had to throw in a different brand for a few days on the fly. I've just changed the oil in my NA6 Miata, Rotella T6 with a Bosch filter (Pickins were slim at Autozone today, and I'd prefer Bosch over Fram or STP) at 123.5k miles.I'm hoping to go turbo the car soon (Spring or summer, so I have time to learn/save/plan) and want to get the oil analyzed, but I'm not sure when to do it. I've heard new synthetic oils can go to 10k+ plus but I've always changed my oil before then. I was planning on sending it in around 5-7k miles, with a few autocrosses thrown in. Does that seem like a decent plan?Thanks everyone! via /r/cars http://ift.tt/2uzLi6w