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Go Back   TDIClub Forums > VW TDI Discussion Areas > Alternative Diesel Fuels (Biodiesel, WVO, SVO, BTL, GTL etc)

Alternative Diesel Fuels (Biodiesel, WVO, SVO, BTL, GTL etc) Discussions about alternative fuels for use in our TDI's. This includes biodiesel WVO (Waste Vegetable Oil), SVO (Straight Vegetable Oil), BTL (Biomass to Liquid), GTL (Gas to Liquids) etc. Please note the Fuel Disclaimer.

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Old April 26th, 2008, 13:16   #1
Join Date: Oct 2005
Location: Virginia
Default Running biodiesel in 2005 Passat concern

I just read the following article:


From what I can gather, it says among other things that biodiesel can work its way into the motor oil thereby degrading its effectivness. I usually change my oil at 10,000 mile intervals. After reading this article, I wonder if I should do it sooner. I would appreciate some opinions from others.
I make my own biodiesel and usually run B20-30 in the winter and B80 in the summer. Any general comments on running biodiesel in the 2005 TDI would also be appreciated.
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Old April 26th, 2008, 13:34   #2
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Join Date: Mar 2001
Location: Reston, VA
Fuel Economy: 54/43/38

The tdi doen't use a post-injection regime for lighting off a particulate trap. It doesn't have one.
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Old April 28th, 2008, 15:03   #3
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Location: Maryland
TDI(s): 2001 Jetta

MWood- There wouldn't be any problem burning Biodiesel in an 05 Passat. What weedeater is talking about is the newer diesels have particulate traps to reduce emissions. All a tdi has is a CAT. Your good to go
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Old April 28th, 2008, 15:17   #4
Join Date: Oct 2005
Location: Virginia

Thanks for the replies.

I guess my main concern was the statement that biodiesel works into your engine oil. I have never heard that before and would think that would be true for any diesel engine and would require more frequent oil changes.
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Old April 28th, 2008, 15:48   #5
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Join Date: Feb 2006
Location: North Bay - Northern Sonoma County
TDI(s): 2005 Passat

I don't know if there is a "concensus" about higher percentage Bio use in the PDs or not. Early on there was much debate on the issue here on the board with much "passion" on both sides of the issue. Much of it seemed to revolve around the added viscosity of Bio over Petro, and how much more stress it might put on the injection system and possibly the top end in our motors. The Search function will give you LOTS to read, but I don't know if it will add any clarity to your thoughts.
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