I'd read somewhere that you should take it easy at first (with mineral oil), but make sure you get through the entire rev range that you'll want to use. The theory being that you're gentle wearing off the chaffing etc, so if you don't ever rev when you're running in, it won't be happy when you try to do it later on. - He may have been talking about rotary engines, or maybe a supercharged V6, I don't remember now.Use a basic non-synthetic oil.
don't pussy the engine but at the same time don't rag the arse off it either.
Have to agree here! With modern honing techniques, the bores are smoother so you need to work the engine harder than you think to get the rings to bed in..George, if you pussy the enginethe rings won't seal and you don't have to rag it to use full revs.
better than having metal filings going round your new engine.That's a lot of oil changes!!!
better than having metal filings going round your new engine.
There should not be any in there in the 1st place
However when I ran my engine in I wrapped a powerful magnet to my oil filter so that any "possible" contaminate would be picked up and kept in the filter.