red diesel has two differences to white diesel the easy one to spot is the colour second is a chemical trace in it customs dont look for colour its the trace they go for you can remove the red in a graphite filter but if you asked around diesel drivers how many have been checked i think it will be very small unless your a farmer or work on a building site red costs from 60-80 p / L i believ it can only be sold in 20L containers not sure i would risk it long term as trace stays in tank for a while but tempted to to try occasionaly