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      02-26-2013, 07:52 AM   #5
Lieutenant Colonel
Autobahn335i's Avatar

Drives: E92 335i
Join Date: Mar 2009
Location: Luxembourg

iTrader: (5)

An engine needs to be broken in because there are metal parts, pistons and the engine block, which need to "adapt" to each other. Meaning there will be a few nanometers of material get shaved off on the first few hundred miles. These metal shavings are collected in the oil which is why an oil change is often recommended after the break in period.

But theres no such thing happening with the turbos. There are no metal surfaces in contact, only the bearing and axles.
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