The most common cause of this after having the engine flushed (which I never recommend.) Would be damage to the oil pump, resulting in low oil pressure which will then seize the engine. What happens is that the sludge and deposits that were sitting there harmlessly are now being pushed around everywhere in the engine. These deposits have to go somewhere, and the most common place for them to end up is the pick-up tube to the oil pump. With the pick-up tube clogged, the pump overheats. When the pump overheats and fails, no oil is being pushed through the system and end result is engine lock-up due to no lubrication.
Wednesday, June 9th, 2010 AT 1:37 PM