agree.. check the pcv valve or positive crankase ventilation valve and check mo na din yung system nya.. check mo na din yung aircleaner mo tignan mo kung may oil.. it means nag back flow yung oil nya.. may pcv filter naman yan.. pag may oil sa air cleaner. check mo na yung pcv valve.. dapat nag rarattle sya, pag hinde barado na sya.. tnx