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Re: Bb
You should be using non-detergent oil to "break in" the engine. This oil will not maintain it's lubricity over an extended period, especially in larger engines. It is also quite "heat sensitive", where oil pressure will drop significantly if the oil temperature gets too high.
Changing the oil accomplishes a couple of things. There is inevitably, some airborne debris that will find it's way into a new assembly. There may also be some residuals from the machining processes. The non-detergent oil does not suspend the dirt in the oil so gravity and flow will "wash" the dirt down to the pan, where it will come out at the first change. The other aspect is that the less lubricity makes the rings wear "in" more quickly. Once all this occurs, you change the oil to a high quality oil (modern, multi-grade) and the engine should be "good to go".
Actually, WOT bursts will aid in seating the rings, if you don't over rev it. 5,000 shouldn't hurt it, as has been stated. I also suggest, you use the engine to slow the car down, after the WOT burst (leave it in 2nd gear, and use engine "braking" to slow it down). This will put pressure on both sides of the rings, further accellerating seating.
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