COULD BE THAT IF THE FUEL/AIR MIXTURE IS OUT, SEEMS LIKELY. OTHER THING I MIGHT SUGGEST IS CAM BELT MIGHT BE SLIPPING. SMOKE LIKE THAT FROM THE ENGINE COULD MEAN 3 THINGS THAT I KNOW OF, BLOWN HEAD GASKET ALLOWING COOLENT INTO THE ENGINE. HENSE THE CREAMY OIL - ITS COOLENT EMULSYFYING IN THE OIL. IT DOEST SOND LIKE ITS THAT - BIG RELIEF, POOR FUEL MIXTURE, SOUNDS POSSIBLE IF THEY HAVE BEEN MESSING WITH THE INJECTOR, OR BADLY ADJUSTED TIMING, SOUNDS UNLIKELY IF ITS RUINNING SMOOTH. IF ITS UNDER WARRANTYY THEN YOU SHOULD BE OK ON ANYTHING SERIOUS. BUT IT DOESNT SOUND SERIOUS TO ME. IF ITS UNDER WARRANTY I ASSUME ITS NOT VERY HIGH MILEAGE WHICH SUGGESTS ITS NOT WORN PISTON RINGS. (WORN RINGS ALLOW OIL INTO THE COMBUSTION CHANGER). I VOTE FOR FUEL MIXTURE OUT. WHY DID U CHANGE THE INJECTOR?