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i remember we had a discussion about this some time ago. Someone mentioned that engines are built much better, and come out of the factory with better quality assurance than 20-30 years ago. When break ins were about getting the optimal lubrication and allowing the gaskets to go through several heat cycles for seating. But today, getting oil through the engine and getting it lubed up is almost instantaneous, and OEM gaskets seat better after it rolls out of the factory.
When i do rebuilds on my rx7, or some other engines I do a pretty extensive break in period. But I wouldn't do the same on a newer vehicle like the BRZ.
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