I'm sure lawnboy oil is fine, but I would switch to full synthetic after break in (apprx 300 miles) for longevity and clean internals.I took the can of lawnboy 2 cycle oil I had in the garage to start with.... hope that is ok... I will search on here for muffler brace ideas unless you have a quick fix for a steady. Good to know about the boost bottle stuff. Engine runs smooth already, has enough pickup for what I am comfortable riding for speed. It's a cruiser, don't need to go 30 on the road. 10-15 seems like an enjoyable ride in the fresh air and scenery.