Your mechanic scares me a bit....
No need to add oil to the gas. It won't do anything except put your fuel injection system at risk.
The DI engine injects fuel into the combustion chamber so added oil will never do anything but make more smoke come out the exhaust. The idea behind added oil to the fuel is to help lubricate the cylinder walls. In a conventional engine that mixture passes through the whole engine before being consumed. On the DI, it never enters the crankcase. The extra oil is supposed to be added to the crankcase during engine assembly to help lubrication.
There's no real trick to breaking them in. In the manual, they just tell you to vary the throttle & keep wide open bursts to a minimum at first, BUT, that those wide open bursts will help a good break in.
So long story short. run it normal, but don't hold the throttle in the same position while cruising. a WOT throttle pull is good from time to time, but keep it under 10 seconds each time & wait at least 20-30 minutes or so of cruising before running past 3/4 to Wide open pulls. But keep all the cruising under 3/4 throttle otherwise.
If something seems funny, running rough, stalling, etc. Shut it down & look into it. even a fresh DI engine should run perfect the very first time its started up.
One other thing I like to do on a fresh engine is run it for about 5 or so minutes, then shut it down & let it cool off. Run it for another 10 or so minutes & shut it off again & let it cool. The idea is to let the cylinder walls & rings cool down as they are getting much hotter than normal as the rings seat. However those cylinders are cooled so well from lake water, it might not really be a necessary step.
the manual doesn't say anything about this on a DI. but it can't hurt.
