[TheBoar]

2011 07/2011 build date
40800mi
Avg. MPG 24.5
90/10 city/Hwy
CBU: Dealer saw it on main relay when serviced for SES

Hoping to do Meth/Water injection and EGR block soon so hopefully help with that a bit and picked up Diesel Kleen for my fill ups. Using Chevron since I'm in Florida.

[geost]

Originally Posted by dokeeffe

I feel your pain! In SF Bay Area carbon cleaning costs 3k for a the diesel carbon and $750 on a gas E90. I commute daily on the freeway ~60miles. I am considering selling it and buying used e90 M3. But I should get Honda on a lease.

2011
335d
79,000
28mpg
60miles per day
Various types of fuel
3 driving style
70highway/30streets
Yes to carbon and emissions problems too

Where do you go in the Bay Area that you pay $3k for CBU cleaning? I just had mine done about two weeks ago in Fremont and it wasn't even $1k... that price is insanity unless you take it to the dealer instead of a good indy shop...

Anyway, my info:

2011 335d
60k miles
~30 mpg
20-100 miles per day (varies)
Texaco diesel mainly, sometimes Chevron or Arco (rarely)
3 on driving scale
60/40 highway/city

Yep. Had CBU cleaned. SES light came on around ~59k miles. It idled roughly and when I would accelerate initially. The CBU was pretty bad, car runs fantastic now. This was the only major issue i've had so far since ownership..bought when it had 28k miles.

[totitan]

Model year - 2009 335d
Mileage -89000
Mpg - 32 avg
Avg speed as fast as possible
Brand of fuel - USA from a very high volume station
On a scale of 1 to 5 how hard do you drive? 4
Highway/City Mix - 75/25

Carbon build up issue yes or no? - No

egr replaced at 21000 miles
DEF system replaced under CPO at 60,000 miles
Oil changed every 6,000
1/4 oz/gal of Optilube xpd used every fillup to increse cetane, clean injectors, and increase lubricity

[timmmmeh]

With all this talk about the Carbon build up issue, I thought it might useful to gather some data. Whether or not you have experienced this issue or not please contribute. I think these are some of the key factors which are relevant to this issue.

Please state:

Model year
2011 335D

51,000 miles
33 avg mpg (Please use the figure found in your BMW)
Avg speed

Brand of fuel (cetane rating if known) - Chevron or Shell mostly. Sometimes off brand if necessary.

On a scale of 1 to 5 how hard do you drive? (1 meaning: I baby my car, 5 meaning: I drive like I am being chased by Cops.) - 3

Highway/City Mix - 60/40

Carbon build up issue yes or no? - YES, at 51,000 miles

Additional Info:
CBU symtoms - rough idle. slight hesitation at acceleration
Codes P02CE and P02CC for injectors 1 and 2 "offset learning at min limit"

BMW dealer quoted me $3300 for the repair. Independent shop quoted me half of that. Hopefully it'll get resolved. Planning on blocking the EGR valve after the fix, and using Optilube SPD.

[OR335d]

Model year - 2011 335d
Mileage -59,000
Mpg - 34 avg
Avg speed: 35
Brand of fuel - USA non-bio
On a scale of 1 to 5 how hard do you drive? 3.5
Highway/City Mix - 60/40

Carbon build up issue yes or no? - Yes, cleaned at 56000

As of three days ago,EGR bypass pipe, DPF, SCR delete, JR 2.8 tune. Shouldn't happen again.