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      04-22-2024, 08:53 AM   #64
e90sanmarino
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Drives: E90 M3
Join Date: Jan 2023
Location: Vietnam

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Quote:
Originally Posted by amrazM View Post
forged pistons are pretty clacky when the engine starts up cold, they expand at a different rate than cast pistons which is why the noise goes away when the engine is hot.
Thank you for the clarification. I appreciate it, and I can now proceed with the engine break-in process with confidence
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