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For a time I was tempted to buy Porsche Cayenne Diesel, but they have some weird restrictions on Bio-Diesel fuels. From : http://www.porscheownersmanuals.com/2

For a time I was tempted to buy Porsche Cayenne Diesel, but they have some weird restrictions on Bio-Diesel fuels. From : http://www.porscheownersmanuals.com/2014-cayenne/10/268-22282/Diesel-Diesel-engine-Fuel-quality http://www.porscheownersmanuals.com/2014-cayenne/10/268-2228... Risk of engine damage and/or damage to the fuel system if diesel fuel with a higher concentration of biodiesel than 5 % is used like B11, B20 or B100. Only use diesel fuel with a blend of 5 % biodiesel (B5) or below. ---------------------------------------------- If I cannot even put B20 in it, there is not point for going with diesel, Cayenne Diesel is the slowest and most un-porshe Porsche!

jhayward 8y ago
That's pretty old. Around the 2013-2015 model years they upgraded the coatings in the fuel pump and injectors to accommodate the higher corrosion potential, mostly due to glycerin-bound water, in biodiesel. As far as I know everything produced today is B20 rated or higher. The fuel systems are all made by the same two manufacturers for the most part.
- deleted 8y ago
  [deleted]
- sremani 8y ago
  This is 2015-2016 manual http://www.porscheownersmanuals.com/2015-cayenne-manual/12/276/Diesel http://www.porscheownersmanuals.com/2015-cayenne-manual/12/2... 2017-2018 manual: http://www.porscheownersmanuals.com/2017-cayenne-manual/16/253/Refueling http://www.porscheownersmanuals.com/2017-cayenne-manual/16/2... I do not think there is 2019 Cayenne Diesel model, but I do not see anything other B5 or less.
  - jhayward 8y ago
    That's interesting, thanks for the links. Since they're using the same Bosch high-pressure pumps and injectors as everyone else I don't see any real reason for the restriction, except perhaps some conservatism in the specs. There's nothing about B20 that would bother any part of the engine or emissions systems once the fuel components are up to date. I suppose they may simply be running out old spec stock. Anyway, to your point, it is disappointing. Along with the whole defeat device thing.
- wutangson1 8y ago
  wouldn't the astm spec for B20 (or any other blend of biodiesel) keep the level of glycerin, soaps, methanol, water, etc. low enough for that not to be an issue? I thought methyl-esters as a solvent would be better for the the engine anyway. But I had a guy tell me two weeks ago that he uses B100 in his new Mercedes wagon despite its 'blue tec' technology.
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pacifist 8y ago
"Only use diesel fuel with a blend of 5 % biodiesel (B5) or below." Don't fall for the FUD. I've been running B99 for 15 years in my 98 Jetta TDI. Everyone else had to replace their injector pump because of the switchover to ultra low sulfer diesel. I'm still running my original injector pump with 275,000 miles and counting. Biodiesel is easier on the engine, lubricates better, and smells better. And most importantly it doesn't add CO2 to the atmosphere.
- yostrovs 8y ago
  "And most importantly it doesn't add CO2 to the atmosphere." Manufacturing bio diesel creates CO2.
  - pacifist 8y ago
    Every time I wake up in the morning and I'm still in the good old USofA, everything I touch has a petroleum component associated with it. Before, I was putting a tankful of CO2 into the atmosphere along with its associated manufacturing footprint every time I filled up. For the last 15 years I've eliminated the part that comes out of my tailpipe. One more benefit: no money goes to the Middle East to fund wars and mayhem and the MIC. It stays local and helps the local economy.
    - wutangson1 8y ago
      is the methanol a fossil fuel necessary for B100 a fossil fuel?
      - pacifist 8y ago
        Neither methanol nor B100(B99) are fossil fuels derived from petroleum products.
ken 8y ago
That's just a standard disclaimer. Has anyone actually tried it? VW documentation says to use B5 or lower in my car, as well, and it's known to be one of the best engines ever for biodiesel. The previous owner and I have run B99 in it for years with no problems at all. It's not much different from running Linux on your computer. Just because they don't test it that way doesn't mean it will necessarily cause problems.

jhayward 8y ago

That's pretty old. Around the 2013-2015 model years they upgraded the coatings in the fuel pump and injectors to accommodate the higher corrosion potential, mostly due to glycerin-bound water, in biodiesel. As far as I know everything produced today is B20 rated or higher. The fuel systems are all made by the same two manufacturers for the most part.

deleted 8y ago
[deleted]
sremani 8y ago
This is 2015-2016 manual http://www.porscheownersmanuals.com/2015-cayenne-manual/12/276/Diesel http://www.porscheownersmanuals.com/2015-cayenne-manual/12/2... 2017-2018 manual: http://www.porscheownersmanuals.com/2017-cayenne-manual/16/253/Refueling http://www.porscheownersmanuals.com/2017-cayenne-manual/16/2... I do not think there is 2019 Cayenne Diesel model, but I do not see anything other B5 or less.
- jhayward 8y ago
  That's interesting, thanks for the links. Since they're using the same Bosch high-pressure pumps and injectors as everyone else I don't see any real reason for the restriction, except perhaps some conservatism in the specs. There's nothing about B20 that would bother any part of the engine or emissions systems once the fuel components are up to date. I suppose they may simply be running out old spec stock. Anyway, to your point, it is disappointing. Along with the whole defeat device thing.
wutangson1 8y ago
wouldn't the astm spec for B20 (or any other blend of biodiesel) keep the level of glycerin, soaps, methanol, water, etc. low enough for that not to be an issue? I thought methyl-esters as a solvent would be better for the the engine anyway. But I had a guy tell me two weeks ago that he uses B100 in his new Mercedes wagon despite its 'blue tec' technology.

deleted 8y ago

[deleted]

pacifist 8y ago

"Only use diesel fuel with a blend of 5 % biodiesel (B5) or below." Don't fall for the FUD. I've been running B99 for 15 years in my 98 Jetta TDI. Everyone else had to replace their injector pump because of the switchover to ultra low sulfer diesel. I'm still running my original injector pump with 275,000 miles and counting. Biodiesel is easier on the engine, lubricates better, and smells better. And most importantly it doesn't add CO2 to the atmosphere.

yostrovs 8y ago
"And most importantly it doesn't add CO2 to the atmosphere." Manufacturing bio diesel creates CO2.
- pacifist 8y ago
  Every time I wake up in the morning and I'm still in the good old USofA, everything I touch has a petroleum component associated with it. Before, I was putting a tankful of CO2 into the atmosphere along with its associated manufacturing footprint every time I filled up. For the last 15 years I've eliminated the part that comes out of my tailpipe. One more benefit: no money goes to the Middle East to fund wars and mayhem and the MIC. It stays local and helps the local economy.
  - wutangson1 8y ago
    is the methanol a fossil fuel necessary for B100 a fossil fuel?
    - pacifist 8y ago
      Neither methanol nor B100(B99) are fossil fuels derived from petroleum products.

ken 8y ago

That's just a standard disclaimer. Has anyone actually tried it? VW documentation says to use B5 or lower in my car, as well, and it's known to be one of the best engines ever for biodiesel. The previous owner and I have run B99 in it for years with no problems at all. It's not much different from running Linux on your computer. Just because they don't test it that way doesn't mean it will necessarily cause problems.