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      02-02-2013, 01:16 PM   #29
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Drives: 2008 335i + 2014 X5
Join Date: Dec 2011
Location: DFW, Texas

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2008 BMW 335i  [4.38]
Originally Posted by BMWNTHZST View Post
my wife's 335i has 51,000km and suffers from carbon build up too Direct Injection is a crappy design

I'm scheduled for the walnut blast on Monday. My question is...moving forward what steps can I take to prevent this from happening again? Should I be using a product such as ZMAX every 5,000K ?

By the way I've always changed the oil in my car every 5,000K and I only put in Shell 91 gas.
There's not really anything you can do to prevent it. It's just something that happens in DI cars. Some people have said that they reduced the frequency of needing an intake valve cleaning after installing an oil catchcan, and running meth injection seems to help as well (but I doubt your wife would want to go that route )

Gas or any fuel additives don't touch the intake valves in a DI engine, so adding anything to the gas tank does not do anything at all for carbon buildup.

2008 E90 335i // Black Everything // photos
COBB tuned / QTP e-cutouts / Helix FMIC / cp-e DCI / AWE BOVs / Catless / FBO + F15 X5 xDrive35i