BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > How much Seafoam for N54

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      09-04-2011, 11:21 AM   #23
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Originally Posted by cc_25 View Post
A proper physical, manual cleaning is the only thing that will make a real difference. The Seafoam won't do much of anything, except burn and fire out the exhaust.
Exactly. Seafoam doesn't do sh*t for carbon buildup (as many Audi/VW owners who tried it have found out). Neither do catch cans, water injection and other gimmicks. The only way to clean out the deposits is by removing the head and applying lots of elbow grease.
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      09-04-2011, 04:43 PM   #24
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Originally Posted by Weaselboy View Post
OP has an N54 with direct injection and a fuel tank additive is not going to clean any valves at all.
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      09-04-2011, 04:49 PM   #25
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N54 = direct injected = no fuel goes through the intake manifold = no fuel additive spraying against the backside of the intake valves.
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