Does anyone have any recommendation of what the best oil flushing agent is? Is there one which works far better than the others, or are they all much of a muchness? (1/00)

Local Mazda dealer uses Forte ... does a good job even if it is Brazilian or something .. I have used the normal stuff from Halfords in the 205k miles diesel .. did alright .. but as you want to avoid driving .. maybe it will have to do!! (1/00)