As a customer of Harmon oil, all I can say is that the service is very consistent and always on time, the driver always rings ahead and gives notice to a time he will be there. As for the quality of diesel it is excellent, I as a small contractor run 3 tractors and also a digger, with no filter on the bowser if diesel was bad,  filters would tell, I have one brand new tractor and as we know new is always sensitive and never a problem, overall all I can say is long may continue with a great service and quality product.