Well the low mileage vito 110hp engine, essentially the same as fitted to the C Class has failed catastrophically. The dealer blames water ingress but the driver, who is a skilled mechanic, is absolutely sure it has not been drowned. The symptoms are a misfire and poor starting. It turns out that valves and conrods are bent. I believe it is due to sticking valves, possibly due to nasty things being put in the inlet air by the exhaust gas recirculation. I'm not going to argue the point with the dealer because water ingress is covered by insurance while mechanical failure is not.
Has anyone any experience of CDi's failing prematurely? I would think someone must have because this dealer has three such engines being repaired as I speak.
Huw