As mick implies, it has just as much to do with making sure you have any oil you choose in good condition.
Noticed that they had "Carlube 10w~40" mineral oil in B&Q for about £12 the other day that would meet the original spec.
I wouldn't use a running in oil specifically but I drain into a stainless steel bowl (Ikea kitchen range) so you can have a really close look at what comes out and see if anything untoward is going on. As you've both said, run to 500 miles and replace should be fine to get you going.