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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, 12:21 PM   #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, 05:43 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, 05:49 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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      12-05-2014, 05:51 AM   #26
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Guys if you open up intake you ll see the carbon on valves it's hard like a rock esp on cyl 5, no detergent can work like the walnut blaster would
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      09-15-2016, 04:31 PM   #27
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Originally Posted by 007_e350 View Post
Guys if you open up intake you ll see the carbon on valves it's hard like a rock esp on cyl 5, no detergent can work like the walnut blaster would
The carbon blasting only does so much, I ended up using seafoam while scrubbing the valves and it made them look new.
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      09-16-2016, 05:29 AM   #28
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Get a walnut blast, but ask for before and after pictures of each port.
Then you know.
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      09-16-2016, 05:40 PM   #29
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Quote:
Originally Posted by galahad05 View Post
N54 = direct injected = no fuel goes through the intake manifold = no fuel additive spraying against the backside of the intake valves.
Exactly. Seafoam or techron in the gas tank will do nothing because its sprayed directly into the cylinder. What cakes up your valves is PCV blow-by vaporized motor oil, which is in the intake stream with air. BTW to the poster who said seafoam can land carbon on a valve stem, we already have this on our valve stems - it is part of the problem. And, you do not have to remove the cylinder head (another post in this thread), only the intake manifold.
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