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Old 05-08-2013, 04:24 PM   #1
igypsy
 
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Default States with 5% Biodiesel and Fuel Additives

So my mechanic said that the enzymes in biodiesel eat up the insides of a diesel engine unless you replace some things made of biodiesel friendly materials. I live in a state where all diesel fuel contains a percentage of biodiesel. Other than doing a costly biodiesel conversion, what can I do to reduce the impact of the enzymes?

He also said that I should be using a fuel additive to keep the system lubricated due to changes to diesel fuel in this country. Which additive should I use and how much per fill up?
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Old 05-08-2013, 04:46 PM   #2
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Default Re: States with 5% Biodiesel and Fuel Additives

Your mechanic is full of bull. BioD is the ester of the fatty acid from natural triglycerides. It does not contain enzymes and it also has very high lubricity.

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Old 05-08-2013, 07:57 PM   #3
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Default Re: States with 5% Biodiesel and Fuel Additives

I used additive many years ago during the changeover to ULSD. Stopped using it after a year of the transition. Biodiesel in 2+% concentrations was a terrific alternative since it had great lubricity.

A side effect of the lubricity additives (or biodiesel) during that transition is that the fuel system in your van and the gas station tanks were scoured by the increased solvent action. An increase in the rate of fuel filter changes was warranted then.

But that was long age and has disappeared as a worry with years of ULSD flowing through the system.

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Old 05-08-2013, 09:30 PM   #4
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Default Re: States with 5% Biodiesel and Fuel Additives

Hmm...I am thinking of firing my mechanic. So no need to add anything because BioD is actually not a problem but rather good for the engine?

Another question: What if your mechanic told you to drive your machine for 1000 miles after they had done a complete flush and replacement before they could figure out if the fluids were getting contaminated by a blown head gasket? No white smoke and no spillage evidence.
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Old 05-08-2013, 09:39 PM   #5
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Default Re: States with 5% Biodiesel and Fuel Additives

Biodiesel is not good for the engine. It will contaminate your crank case oil over time and will not do as good a job as it is intended. 5% is the max MB recommends for the 2010+ vehicles, and if it were up to me I'd never use it because I suspect 5% is just below the threshold of what MB predicts would cause for warrantee claims or overt damage. That or they'd have to spec more frequent oil changes which would impact a business customer ROI purchase calculations, and therefore might negatively influence sales.
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Old 05-08-2013, 09:53 PM   #6
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Default Re: States with 5% Biodiesel and Fuel Additives

Okay so there seems to be a difference of opinion! Bear in mind - a) I don't have a choice since up to 5% is in all the diesel fuel in this state (so I am told) and b) I have a 2003 which CAN run on biodiesel because it was not changed for the US market (or so I'm told.)
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Last edited by igypsy; 05-08-2013 at 10:12 PM. Reason: changed "all the biodiesel fuel" to "all the diesel fuel"
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Old 05-09-2013, 12:19 AM   #7
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Default Re: States with 5% Biodiesel and Fuel Additives

Not sure if this applies, but "Even though for years biodiesel has been heralded as a lubricity additive helping keep fuel system components like the moving parts inside fuel injection systems operating smoothly, the bitter irony here is that, when post-injected, it tends to dilute engine oil and interacts with additives and increases the possibility of engine wear. Much work remains developing viscosity improving, anti-wear, dispersant and detergent additive packages in which adverse reactions with biodiesel are significantly reduced. " I'd be curious how others interpret this as applicable to our engines/DPF's
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Old 05-09-2013, 12:34 AM   #8
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Default Re: States with 5% Biodiesel and Fuel Additives

So is there anything that I need to do at all with a 2003 Sprinter regarding fuel other than having more frequent oil changes? Additive yes or no? If yes, what?
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Old 05-09-2013, 01:48 AM   #9
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Default Re: States with 5% Biodiesel and Fuel Additives

First off....igypsy, you have a 2003 and therefore no DPF so no post injection takes place in your engine. Biodiesel is a more effective lubricant and fuel system cleaner than just about any additive on the market. Bio also helps improve the cetane rating of a fuel and will also lead to lower emissions due to its oxygen carrying characteristics (pure bio is 11% oxygen by weight).

Anyone who wants to come over to the dark side and read Arlen Spicer's in depth additive study read the first post here,

http://www.dieselplace.com/forum/76-...y-results.html

Second, to all the folks with 2007 to 2009 NAFTA vans with a DPF, I sampled my oil in my 08 at every service and I ran bio a fair bit, I NEVER, had an oil dilution issue from bio diesel post injection contamination.

Thirdly, for the 2010 and up that have AdBlue SCR systems, the emission system requires far less active DPF regeneration (when post injection occurs and results in fuel getting into the oil). Someone may correct me, but I believe Mb went the same route the rest of the world did in 2010 and quit using post injection to regen the DPF and used a dedicated purpose built injector post turbo.

Fourthly, If you have a pre 07 5 cyl engine, you don't have to use MB229.51 oil. Pre 229.51 oils handle bio fuel contamination pretty well. MB knows 229.51 sucks at dealing with bio contamination, hence, they have come out with MB229.52. The updated spec changes are almost exclusively to deal with the effects of biodiesel in the oil. Of note, I know of no one currently selling certified 229.52 oil in the US or Canada yet.


Your mechanic is full of tall tales.....bio is fine, I used 20% concentrations at times with no issues and ran 11% a fair bit. Oil samples when I was "off" bio were statistically indifferent. I also never found any additive made any real difference in fuel mileage or performance in the 2 1/2 years and 200,000 miles I ran my 2008.

YMMV....
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Old 05-09-2013, 03:48 AM   #10
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Default Re: States with 5% Biodiesel and Fuel Additives

Definitely firing my mechanic...grateful to this forum...
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