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X5D: Best way to clean carbon from block?
I am currently in the process of deleting. I cleaned the plastic intake manifold but there seems to be some considerable build up on the runners from the block.
I currently own an N54 and N55 and understand the process of walnut blasting. it is the same for the M57? Is there a DIY? Is there another way to clean the runners? Seafoam?
Also, I did search but didn't see much.
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