Hi All Just had my corolla SX serviced and they suggested an engine de -coke---fine ,except that it is now fumey !!--no smoke,but unpleasant cabin fumes,has done 277K and still has plenty of poke,no bottom end noises etc ,so I am not happy. Tried additives to no avail---? best solution--? re-build or try my luck with a changeover(ie used but approved)(should read 4AGE of course! Tx