Hi, I want to know at what max speed is safe to break in my new sportivo, and i have read from isuzuclub from sir Benz that break-in is a thing from the past, we know that 4jai is an old engine, so do i have to break-in? at what max speed?

Is there a truth also about the so called new engine training? kasi some mechanics said that, if you breakin in only at safe speed daw, ma trai train daw engine mo at this speed and mahihirapan na daw umabot ng very high speed. totoo ba?

And lastly, how many seconds or minutes should i set the turbo timer to shut off?