gave the disco a service today, oil/filter, fuel filter and cleaned the sedimentor (full of crap).. shes putting out some white smoke ( unburnt fuel ) when first started, i know the worst case it could be a compression issue but am hoping its going to be something less serious i.e injector as mentioned above.. ive used some redex, hasnt been half bottle to full tank, just a rough guess everytime i put fuel in...probaly used half now. anyone know if redex is any good, if so how much/many miles should i be expecting to use to get any benefit if its the injector.