I work on DLs and others all day, everyday. I can tell you from experience that on any new engine that was not run at the factory (DLs for instance) you can save your shoulder a bunch of wear by lightly seating the needles then opening them up 1-1/2 turns each then start the engine, let it warm up and adjust the high speed to the rich side of peak and low for best leanest transition from the first tank. If you have a helper it's easy to do with the engine running (be careful) and you can see and hear how the adjustments effect the way the engine runs.

DLs typicaly start well with factory settings but once in while one will miss the needle setting procedure and will be way off. No engine, I don't care who built it, comes with the needles set correctly for your application, location, fuel/oil mix, and load. Learn how to adjust your carb or find a friend that can help you. I've talked many through the process, it's easy and only takes a few minutes.

As for oil, where do you think these engine designs originated anyway. Chainsaws and weed whackers, quality saw makers label some of the best 2 stroke oil on the planet. Lots of other oils work well but from what I've seen Amsoil isn't one of them. If you use it and only put 5 or 10 gallons through your engine a year you will likely not have any problems but start burning 30 or 40 gallons a year in your engines and I guarantee you will be switching oil after the first couple years.