hI AGAIN, ANYONE GOT AN IDEA ON COLD START UP OF TD5 ES AUTO, FULL SERVICE 2001,GET BLUE/WHITE SMOKE JUST FOR FEW SECONDS ENGINE CHUGS A BIT AND CLEARS AFTER A LITTLE REVING, NO SMOKE AT ALL WHEN WARM AND PUSHED HARD. IS IT COMMON? I KNOW DIESELS SMOKE A BIT WHEN COLD BUT WAS TOLD POSSIBLE PISTON RINGS? HELP