Another but older article.
"Biodiesel is now blended at a rate of 5 percent or less into almost every gallon of diesel fuel sold in the U.S., and its use is expected to climb."
The renewable fuel is present in almost every gallon of diesel now sold in the U.S. and its use is expected to climb. But is it safe for cars?
www.edmunds.com
"Biodiesel is approved for blending with petroleum diesel/distillate under the American Society for Testing and Materials specification
ASTM D6751. Most U.S. biodiesel is consumed as blends with petroleum diesel in ratios of 2% (referred to as B2), 5% (B5), or 20% (B20). There are some vehicle fleets that use B100 (neat biodiesel). Much of petroleum diesel fuel sold in the United States actually contains up to 1% biodiesel because of biodiesel's lubrication qualities that potentially prolong the lifetime of certain engine components. Biodiesel is added to petroleum diesel only at blending terminals into tanker trucks for local distribution."
U.S. renewable diesel summary.
www.eia.gov