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      02-02-2013, 12:41 PM   #28
BMWNTHZST
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Drives: 2015 F80 M3
Join Date: Jan 2009
Location: Toronto

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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.
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2015 F80 M3 ///M Alpine White / Black
2008 E93 335i Black Sapphire Metallic / Saddle Brown
1997 840Ci Jet Black / Black
2004 E46 ///M3 Laguna Seca Blue / Black