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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 November 26th, 2016, 06:11   #16
mrseadog
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Join Date: Mar 2015
Location: St. Louis, MO
TDI(s): 2002 Jetta
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Of course biocides will do nothing about free water. My posting had to do with the "issues" brought up in the Mercedes brochure regarding the use of biodiesel, ie, fouling of fuel filters due to biologic sludge.
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Old December 7th, 2016, 00:24   #17
jerryfreak
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what a load of BS.

all that mercedes brochure says is that out of spec fuel will damage your engine

if your fuel has free water....guess what? it is out of spec
if your fuel has high acid value... it is out of spec
if your fuel has high sodium... it is out of spec
if your fuel has less than 3 hr oxidative stability... it is out of spec
if your fuel is decomposed to varnish... it is because you let it get out of spec
and the biggest giveaway of all...."Fuel that contains any percentage of “home brewed” biodiesel does not meet Mercedes-Benz fuel standards and must never be used in Mercedes-Benz vehicles."

how would they know it doesnt meet the standards? its actually pretty easy to homebrew astm-spec fuel. all you need is some diligence and 200 ppm of oxidative stability additive

yes engine oil dilution is a real (and easily monitored/mitgated) problem, but thats not really news

Last edited by jerryfreak; December 7th, 2016 at 00:27.
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Old January 6th, 2017, 07:02   #18
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I service a LOT of TDI's. The only cars coming in with injector issues are the Illinois cars with B20 use. Wisconsin does not mandate the use. Only one diesel seller (petro stations) now are B5 all the time. I've replace 6 set of Passat and 11 sets of Jetta injectors due to Bio killing them. All were between 80-150K miles. Never had to do a set run on strait #2.
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Old January 7th, 2017, 09:22   #19
piotrsko
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Fuel Economy: 46 city/56 hwy so far wonder what the Golf gets
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how the heck do you run straight D2 in Wisconsin in the winter? Last time I was there I ended up using a whole quart of white additive just to get the 250 running.
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