Lots of good info here and some very good diagnostics info. Here’s a little more. If the carb is running too rich it can wash out the rings on a new engine. Also, here is some old school stuff. If you’re burning oil, have somebody drive behind you. Get to a good cruising speed. Jump on the car and if it smokes while accelerating it could be rings if it smokes when you back off a the hard acceleration could be your valve seals.