i had the same thoughts, the theory behind it being that the cheap oil beds in all the bearings etc quicker.

The only other thing to note is the oil literally should only be used to run it in up to temperature, DON'T DRIVE ON IT FOR THE SAKE OF YOUR TURBO!!

Once you've run it up to temperature you can let it carry on idling for a while, but then you need to drain it out and use your long term oil and change the filter, that mineral stuff wont be good for your turbo if your boosting.