2003TRD, THe lable on LC has been changed since it was first introduced to this board. The previous instructions wich had been in use for well over 20 years was a lot more agressive. Driveing around with the flush dosage in the engine for badly sludged or varnished engines was mentioned by it's current promoter. The promoter of the product claimed that this procedure had previously been aproved by LC's inventor.