I just heard a story of someone who bought a new Victa with a B&S motor. It had the needs oil on, so the B&S oil was put in. Then motor started, and they mowed for a couple of minutes and , engine made a noise and stopped.
The engine was siezed, but the supplier manages to jiggle the blade bar to free the piston. Got it started and all is OK.
They said they never let the oil soak in enough before starting, but I think the motor was probably revved up, where with a new motor, you should put a teaspoon of oil in cyninder and run it a low revs just to run it in a little. And get the oil slinger inside to work properly.....
There's nothing like starting a new engine.........
speedy