Hello!I got Nissan Sentra B14,when I stop at traffic light and the time ready to go,I press bit harder on fuel paddle as I insert 2nd and 3rd gear,there is some white smoke came out from the car exhaust,the funny thing is,the white smoke is not contineous,it just blow out for 2 or 3 second,then the car would go smooth without smoke.....I wonder perhaps the piston ring had wore out or the inner engine part had too dirty,cos I am now using STP Oil Treatment,some...