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Old 08-03-2007, 04:22 AM
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Join Date: Jun 2007
Location: Indianapolis, IN
Posts: 22
Smoking when switching to Biodiesel

Hi, I should start off saying I am new to Mercedes and Diesel cars so.... I have been looking for a while and finally found my MBZ. I have driven it around 800 miles so far with no problems. I decided to start trying biodiesel so I filled up with b20. After a day or so (50-60 miles) I started noticing it smoking a bit and I think fumes were coming into the cabin. I bought new fuel filters in anticipation of the switch but thought it would take a couple of fill ups with bio to start noticing anything. Is it possible that a clogged fuel filter is causing the smoke? I have not noticed a power loss. Anyway any experience on this matter would be greatly appreciated. Thanks in advance, Alex
'76 300D Euro Model 4sp Manual 108k
'83 300D 4sp Manual Conversion
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Old 08-03-2007, 04:39 AM
diametricalbenz's Avatar
The Crowbar of Embriage
Join Date: Oct 2004
Location: Seattle, WA
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You may have an exhaust leak in the downpipe.
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Old 08-03-2007, 07:35 AM
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Join Date: Nov 2004
Location: CT, USA
Posts: 472
It may also be a fuel line leaking onto the exhaust.

Just a wild guess.
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Old 08-03-2007, 07:46 AM
biobenz240d's Avatar
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Join Date: Jun 2006
Location: Western New York
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what color smoke ? white ,black, bluish? any smoke with just the dino diesel? whitish smoke would be a bad head gasket, burning some antifreeze. black smoke is excess fuel ,lightl black smoke is somewhat normal, bluish smoke is unburned fuel ,eiher motor is still cold or poor compression. I run b100 with very little smoke at startup when cold .
'83 240D 264k on 100% biodiesel/ 31mpg
83 300D 217K the $800 gem
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Old 08-03-2007, 11:21 AM
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Join Date: Aug 2005
Location: Buford, GA
Posts: 438
BioD should smoke less, and the smoke (like on acceleration) should be more haze than dark smoke, especially in the higher percentage BioD.

The inside smell is another issue. I would definitely check out the exhaust system. I had a very small crack in the expansion area (300SDL) and it would be most noticeable at start up. The sooner you get that fixed, the better (for a number of reasons)
One main PITA is still getting the 'smoke' off of the windshield (inside) I have cleaned it with vinegar, ammonia, and a number of other things, and finally seem to get most of the crap off.
87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
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