don't believe the salesman
Although intuitively it would seem that the salesman should know what he is talking about, for the most part this will never be the case. There is no reason to leave factory oil in for any amount of time.
Also not switching to syn oil untill it is broken in is an old wives tail. Syn oil is good, but you engine is still going to wear in or break in. Syn does not stop all wear.
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