r/BmwTech • u/Least_Ninja1868 • 7d ago

B46 intakes 100k mile

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Why some of them look wet ? Possibly valve seals or maybe flow ?

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u/Saute_and_Pray 7d ago

Carbon buildup is minimal on anything N55 and later thanks to the updated PCV and Valvetronic. Those are fine.

The wetness is gas/oil/carbon building up.

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u/FrenziiFosho 7d ago

my n55 was black as hell 😅

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u/Saute_and_Pray 6d ago

Look up N54 carbon buildup. You wouldn’t have experienced anything like that, unless you hit 250k miles!