GMC Duramax Diesel 2015 Owner's Manual page 51

9-24 Driving and Operating
Pumps dispensing more than
5% and up to 20% biodiesel are
required to be labeled with the
concentration of biodiesel. When
refueling with a biodiesel blend
above B5, one of the following
labels should appear on the
dispenser:
Blends containing more than 5%
and up to 20% biodiesel must
meet ASTM specification D7467
(Biodiesel blend, B6 - B20).
Biodiesel quality can vary widely.
To reduce the risk of poor quality
fuel, purchase biodiesel blends
from a BQ-9000 certified
marketer. See www.bq-9000.org
for a list of certified marketers.
As a renewable fuel, biodiesel
provides some environmental
benefits. However, biodiesel has
unique properties and needs to be
handled differently than diesel fuel.
Its use presents additional risks and
may not be appropriate in all
situations. Certain vehicle operating
modes increase these risks and
should be avoided. Read further to
determine if your driving habits are
compatible with the use of biodiesel.