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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Carbon Build Up Stats Thread



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      11-26-2013, 11:05 AM   #89
dixy2k
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That's what the shop foreman told me too. There is nothing I can do to avoid the problems. Bad design.

Maybe a different car.
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      12-15-2013, 09:00 PM   #90
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335d Ecotune remap
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28.9 avg MPG
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5% Biodiesel Blend & Power Service additive - BP franchise. Cetane: 50
Drive type 4
67% City, 33% Highway

No carbon build up issues that I know of.

Bought with 32,300 miles in 4/2013. One previous owner in Texas.
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      12-16-2013, 04:23 AM   #91
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Year: 2011
Model: 335d
Miles: 33k
Average mpg: 21.5
Average speed: not sure
Fuel: 76 sometimes chevron
Drive type: 3
Highway/City: 30/70
Carbon build up: Yes
Additional info: Bought the the at 9k was a dealer loaner and had build up at 26k I believe
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      12-16-2013, 11:16 AM   #92
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for the sake of this thread, how are we defining "experienced the carbon buildup issue"? Throwing a CEL? Loss of MPGs? or just visible signs upon disassembly?
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      12-16-2013, 11:44 AM   #93
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Quote:
Originally Posted by FormerRotor View Post
for the sake of this thread, how are we defining "experienced the carbon buildup issue"? Throwing a CEL? Loss of MPGs? or just visible signs upon disassembly?
I assumed it was the latter, but I suppose the OP needs to define it.
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      12-16-2013, 03:07 PM   #94
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Quote:
Originally Posted by FormerRotor View Post
for the sake of this thread, how are we defining "experienced the carbon buildup issue"? Throwing a CEL? Loss of MPGs? or just visible signs upon disassembly?
My carbon build up was confirmed by the dealer while replacing my injectors.
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      12-16-2013, 03:08 PM   #95
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I was told by the shop foreman that my car was all clogged up by soot deposits. I have no other way of knowing/confirming.
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      12-16-2013, 04:04 PM   #96
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Quote:
Originally Posted by chau View Post
My carbon build up was confirmed by the dealer while replacing my injectors.
Same thing with mine and stayed at the dealer for almost 2 weeks.
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      12-17-2013, 12:44 AM   #97
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Quote:
Originally Posted by diaz92376 View Post
Same thing with mine and stayed at the dealer for almost 2 weeks.
Mine has exceeded 2 months!!

Anyone know why they choose to replace the intake instead of cleaning? I know it is plastic but disposable?
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      12-17-2013, 12:50 AM   #98
dixy2k
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Quote:
Originally Posted by ficklerx View Post
Mine has exceeded 2 months!!

Anyone know why they choose to replace the intake instead of cleaning? I know it is plastic but disposable?
My guess is that the dealer can make more money through the warranty pay if they replace the "faulty" part, than cleaning it.
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      12-17-2013, 10:05 AM   #99
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Redesign of the CCV was what I was told...and it's cheaper for BMW to replace the parts...get the old ones, clean themselves and put back in rotation.

Again maybe lines I was fed.
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      12-20-2013, 10:10 AM   #100
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Year: 2011 (build date 7/11 - post EGR fix)
Model: 335d
Miles: 45k
Average mpg: 34.5
Average speed: 42 mph
Fuel: Shell diesel
Highway/City: 80/20
Carbon build up: No problem (might be there but no SES)
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      02-23-2014, 06:56 AM   #101
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2011 BMW 335d  [0.00]
2011 335d

Almost 50,000 Miles

27.3 mpg, 35 mph (both averages of my typical drive)

Normally fill up at Speedway, don't know cetane

On a scale of 1 to 5 how hard do you drive? 2 or 3 depending on traffic

Highway/City Mix: 50/50

Carbon build up issue yes or no? YES

Additional Info:
Started to get limp mode about 43000 miles. Repair history:
1) thermal sensor was replaced (fall, 2013).
2) Limp mode again Jan 27, got car back Feb 25--REmoved cylinder head and sent out to remove carbon buildup.
3) SES came on 15 miles later, we'll see what they say now...

I'll post the codes when I get the car back.
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      02-24-2014, 09:35 AM   #102
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Look, Ma! No more carbon!

Hey everyone.

It's been just over a year since my last carbon-related SES. My 2009 335D is just about to hit 70k miles.

I truly believe my last trip to the dealer for carbon was due to extremely low fuel quality. After my first buildup post, I stopped using convenience store fuels (WaWa here in eastern PA, Cumberland Farms etc. up in New England) and stuck instead with Shell and Sunoco mostly.

Due to some particularly poor planning on my part, I found myself outside of my normal haunts and in need of fuel not once, but twice in a row! First time I grabbed a tank of WaWa diesel and when that ran out, I tried a Volero station. Not 200 miles after the Valero stop I got the SES. The corresponding trip to the Dealer resulted in a new manifold and several sensors. I posted the details of that trip last January (2013).

Since then, I have stuck to my Shell/Sunoco routine. I have also started adding Power Service 03080-60 Cetane Boost and Diesel Cleaner to the tank at fill-ups (http://www.amazon.com/dp/B001JT1FJ6?tag=deadt-20). My Mileage has remained about the same, power feels better and no carbon buildup for a full year of heavy (30k miles) driving.

Hope that helps. Happy motoring.
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      02-24-2014, 08:51 PM   #103
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Model year
2011 335d
33,000 miles
23 mpg Avg.
25 mph Avg.
Shell 40 Cetane
3 to 5
All City

No Carbon build up and no check engine lights! Mixture of Power Service Diesel Kleen Cetane Boost and LUCAS fuel injector cleaner at every fill up. May be switching to Opti-Lube. Co-worker with the same car just ordered it after reading good reviews and will be testing it out.
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      02-28-2014, 12:47 AM   #104
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2011 BMW 335d  [0.00]
Model: 2011 335d (Build Date: 01/2011)
(EGR Fix at 18,249 Miles) Own for 8,249 miles at that point.
Current Mileage 46k
Average MPG - 30
MIX of everything + Biodiesel or Opti-Lube on most fills
Driving style 4.5
50/50 Highway City

CBU - None

Been good to me for about two years now.
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      03-04-2014, 08:09 PM   #105
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2011 (2/2011 build date)
335D
Mileage: 44,600
Just purchased, so I have no information on fuel and driving style.

Carbon build up issue yes or no? Yes.

Additional Info:
I just purchased the car and took it to the dealer with an SES light and the common "red hose" oil leak. They found carbon buildup and are replacing the intake manifold under warranty as we speak. I'll update this post with all the repairs done when I pick the car up.
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