i have been told to use cheap shit deisel oil for running in
as its similar to petrol oil but cant take the high revs and temps the petrols make (doesnt matter for running in tho as revs are kept low)
plus it has a cleaning agent in it so wipes away the shit from the engine at the same time

ive done this a few times as have a few others i know and none of us have has problems.

i normally run an engine in as described above but for longer periods with increasing load and boost.


think of it this way tho,
any1 that has bought a brand new car, did u run that in or jump in and abuse it cos its got a warranty so doesnt matter if it breaks? and did you then have any troubles with that engine???