Yes it is safe to mix petroleum diesel and biodiesel. Blends of biodiesel and petroleum diesel are designated "BX." Where "B" states that the fuel mixture is a biodiesel blend and "X" indicates the percentage of biodiesel in the blend. For example, common blends of biodiesel in North America include B2 (2% biodiesel), B5(5%), B20(20%), and B100(100%). B100 is also know as "neat," or pure, biodiesel.
Diesel is a fuel burned in some vehicles. It is produced from petroleum, just like regular gasoline. The most popular/well-known brand of diesel engines is Powerstroke, from Ford Motor Company. Other forms of diesel are BioDiesel. BioDiesel is made out of corn. If you've ever heard of "B20" that means 20% BioDiesel. The mixture is 20% BioDiesel and 80% Regular Diesel. If you hear "B40" it is 40% BioDiesel and 60% Regular Diesel. If it is "B100" it is 100% BioDiesel and 0% Regular Diesel. That is what diesel is....
No, it is not.
A diesel engine is a biodiesel engine. If you have a diesel engine, you can fill it up with biodiesel anytime.
Biodiesel
Just about any diesel vehicle will run on biodiesel.
A 2004 Toyota RAV4 is not designed to run on biodiesel or a biodiesel blend, as its engine is not compatible with the properties of biodiesel. Using biodiesel or a high blend of biodiesel could lead to fuel system damage and void the vehicle's warranty. It's advisable to stick with conventional diesel fuel if you have the diesel variant or gasoline for the gasoline variant. Always consult the owner's manual or a professional mechanic for specific fuel recommendations for your vehicle.
the biodiesel should be used in the diesel engine, and there are some biodiesel motorbike has been produced such BWM http://www.doinggroup.com/
If it has a diesel engine you can.
Biodiesel is a type of diesel fuel made by refining ordinary vegitable oil. It can be used in almost any engine that petrolium based diesel can.
Yes
Blended with what?? With regular diesel; YES
Diesel fuel, biodiesel, BTL and GTL