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Yes it's in the manual but if there is more than 5% it changes the oil change interval and more is not reccomended (>20%) and cannot be used.

From the 2015 Diesel owners Manual.

"Biodiesel Fuel Requirements
A maximum blend of 5% biodiesel meeting ASTM speci- fication D975 is recommended for use with your diesel engine. If frequent operation with Biodiesel blends that are between 6% and 20% (B6–B20) is desired, the main- tenance schedule is subject to shorter intervals.
The oil and filter change along with fuel filter replace- ment is subject to shorter intervals when operating your engine on biodiesel greater than 5%. Do not use biodiesel greater than 20%.
For regular use of biodiesel blends between 6% and 20% (B6–B20) it is important that you understand and comply with these requirements. Refer to the “Maintenance Chart” in the “Maintenance Schedules” section for fur- ther direction.
STARTING AND OPERATING 61
CAUTION!
Failure to comply with Oil Change requirements for vehicles operating on biodiesel blends between 6% and 20% (B6–B20) will result in premature engine wear. Such wear is not covered by the New Vehicle Limited Warranty.
Biodiesel is a fuel produced from renewable resources typically derived from animal fat, rapeseed oil (Rapeseed Methyl Ester (RME) base), or soybean oil (Soy Methyl Ester (SME or SOME) base).
Biodiesel fuel has inherent limitations which require that you understand and adhere to the following require- ments if you use blends of Biodiesel between 6% and 20% (B6–B20). There are no unique restrictions for the use of B5.
5

62 STARTING AND OPERATING
CAUTION!
Use of blends greater than 20% is not approved. Use of blends greater than 20% can result in engine damage. Such damage is not covered by the New Vehicle Limited Warranty."
 

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Sadly in the Chicago area all fill stations only carry B20, annoys the heck out of me. If I want pure diesel I need to go at least 40 miles south or west.
 
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