Yes, I tried all the spray in air intake gubbins of various sorts, just seemed to work for a week at most. I do a lot of short trips so it has lasted pretty well I suppose. I will be using the "expensive" diesel from now on and make sure I keep the revs up. They put this thing in the most awkward place they could, I suppose there must me some technical reason for it other than creating work for their dealer network, although I went independent for half the price. Limp mode couldn't get much over 50 which was embarrassing. It'll be DPF next!