Fully run in and going strong!
Join Date: Jan 2007
Location: Farnborough Hampshire
If he is that old he wouldn't have heard of it.
There is no reason why you can't use both, the Specialist one is specifically for injectors.
Round here we all swear by it, engines that failed the MOT massively, pass after a couple of hours of driving with no more than a can of this in half a tank full of fuel.
This comes direct from the rep.
Do NOT use the old trick of putting additive neat into a new filter, this stuff is so powerful it may well cause damage!
Very first upgraded D22 - 10 years and 72K miles and still going strong!