Quote:
Originally Posted by IMSPD92022
However, in my experience of breaking in many small block GM engines, Gen III, IV, and V, they aren't truly broken in and seated until over 6K miles if you run synthetics.
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Wrong.
There are countless dyno tests on multiple forums that show ~90% of breakin occurs in the first 10 heat cycles. There is some slow residual sealing that occurs over a longer period