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.