FCA recommends 5 percent bio but you CAN use up to 20 percent. However, if you consistently use high percentage bio, they require a different service schedule.

See pages 40 thru 44 in the linky to the diesel owners manual :thumbsup:


http://www.wk2jeeps.com/manuals/2014_wk_owners_manual_diesel_2nd.pdf

 

Here in the People's Republic of IL, it's really hard to find B5. The state offers "incentives" to fuel companies to sell B20, in other words they reduce the road tax on B20 only. So it's really hard to find B5 because the tax reduction on B20 means more $$ for fuel companies. I fill up with B5 every other weekend when I'm in WI and can feel the difference.

If you run B20 be sure to run a good winter additive like Power Service Diesel Fuel Supplement Winterizer.

 

I ran as high as B20 with our 2008 CRD when I lived in Oregon never noticed a significant drop in mileage. My commercial fuel supplier used to have B99 at a station close to us and even that didn't have any big impact on milage with our 2008 CRD.

and had a commercial supplier and didn't notice any change in mileage bigger than other variables like the amount of city vs. highway miles and time stuck in traffic jams. 2008 CRD had about 130,000 miles on the odometer with no fuel-related problems when we traded it in.

 

The problems come with the way the emission systems work now. In a DPF Regen cycle unburnt fuel is dispensed from injectors which passes to the DPF.

That unburnt fuel can dilute the oil, regular diesel has a lower flashpoint than bio diesel so it evaporates off easier. Continued use of high bio diesel can dilute engine oil leading to engine problems.

 

That unburnt fuel can dilute the oil, regular diesel has a lower flashpoint than bio diesel so it evaporates off easier. Continued use of high bio diesel can dilute engine oil leading to engine problems.

Hence the recommended 8k oil change interval for use of fuel between b5 and b20, instead of the standard 10k interval.

 

If you are in the Chicago area it can be difficult to find any stations selling anything but bio because the great State of IL gives tax breaks to stations that serve up biodiesel. I live in the Northern 'burbs and always fill up at Ernie's in Lincolnshire as they have no intention of serving up Biodiesel. Someone put together a map of all of the Petro Diesel (non-bio) stations in the Chicago area that is helpful.
https://www.google.com/maps/d/viewe...9cfKbe5JQJPtr-h_4BL41fUjx0&hl=en_US&ll=41.96328519134469,-88.86189000000002&z=6
I find that the pure diesel will give you better mileage as well.

 

Only pure diesel for me. When I drove across the country to pick up my trailer, I had a hard time finding pure diesel in Iowa (corn country). Just like folks looking for fuel without ethanol. Ended up fueling up at a place called Casey's. They had pure diesel.
Like folks have mentioned it impacts your maintenance schedule if you use above B5.
I hated the fact that pumps where showing B5-B20. No idea what was in there.

 

Minnesota will be requiring B20 in the summer months next year.
Minnesota biodiesel standards to double in 2018 - StarTribune.com

I used to run anywhere from B10 (winter near freezing temps) to B99 in Oregon with our 2008 CRD. Then around 2014 my supplier changed their distribution so it was an hourlong trip out of my way to get anything over B20 which didn't happen very often.

 

Biodiesel is just not the solution - it's only propagated and forced onto the rest of us by the corn-hole'ers (more specifically, the soy-*******) in the mid-west. Renewable Diesel is what ¢alifornia is pushing and it in fact, is superior to not only biodiesel, but regular diesel in almost every way.

https://www.neste.com/en/what-difference-between-renewable-diesel-and-traditional-biodiesel-if-any

 

I'm surprised that nobody mentioned here that Bio Diesel also SCOURS your fuel system, dislodging and removing any previous contaminants adhering to all fuel tanks and lines. Its almost like Ex Lax for your fuel system. There are documented stories out there of Plugged fuel filters and even HP fuel pumps being damaged from contaminants getting past the filters on older systems.
A. I try to avoid it at all possible costs, If possible...
B. I keep spare fuel filters with me at all times travelling in B5-20 areas. If you notice a change in performance or rough running, change them filters 1st, after running Bio Diesel!

Sometimes you just can't avoid it and it certainly is not the end of the world..... with the right precautions it can be acceptable if not avoidable.....

 

I'm surprised that nobody mentioned here that Bio Diesel also SCOURS your fuel system, dislodging and removing any previous contaminants adhering to all fuel tanks and lines. Its almost like Ex Lax for your fuel system. There are documented stories out there of Plugged fuel filters and even HP fuel pumps being damaged from contaminants getting past the filters on older systems.

So what's the downside if you run BioDiesel on the regular?

 

I've gone up to Eagle River, WI a few times, north of Madison it goes non Bio for Diesel. I've noticed significantly higher MPG with non Bio. Most places have a sign at the pump saying they add Schaffer Lubricant additive in the fuel.

Bio is good and bad, it has lower energy BTU, that would explain the MPG difference. However the soybean oil they use is a great lubricant. Good for the fuel system.

The reason why the manual states a difference in oil change mileage for bio diesel, the belief is during regeneration some fuel will end up in the crankcase, real non Bio diesel sheers the viscosity of the engine oil where B20 Bio diesel thickens the engine oil. The manufactures are concerned about Oil thickening, where in fact I haven't seen this thickening idea come up on an oil analysis.

End point, I don't think Bio helps the environment, increased fuel usage combined with higher GHG emissions, seems counter intuitive.


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I've gone up to Eagle River, WI a few times, north of Madison it goes non Bio for Diesel. I've noticed significantly higher MPG with non Bio. Most places have a sign at the pump saying they add Schaffer Lubricant additive in the fuel........

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I'm up in WI every other or third weekend and always fill up there rather than here in the people's republic of Illinois where B20 is essentially mandated. The good stuff in WI is a few cents more than the B20 that is tax subsidized here in IL, but the cost difference is eaten up by having to run Power Service additive at every fillup. I pick up at least 2 mpg and feels like 25hp with the good fuel.

 

While I like using domestic energy sources, I don't like driving up food prices by increasing demand for vegetable oils. I should look up how much oil is saved with biodiesel by the time you add in the petrochemicals needed for fertilizers.