Paul223 Posted January 6, 2014 Report Share Posted January 6, 2014 (edited) 'Red' or gas oil and Central heating oil is chemically marked and this marker is tested for, the red dye is only added for your convenience to let you know it's 'red', no amount of fullers earth, loafs of bread, blue dye or special tablets are going to remove the marker Run it low top up with white and keep your receipts and mileage for a few months Edited January 6, 2014 by Paul223 Quote Link to comment Share on other sites More sharing options...
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