could be moisture sa internal structure? particularly in the exhaust department? "kadalasan" normal lang yan sa cold climates.

dont worry too much...

anyways, do you find your van drinking too much engine oil? as in nababawasan ang oil mu in an strange manner. bigla na lang nababawasan? eto yung mga symptoms na may oil nga sa air-fuel mixture which means your engine is burning oil.

or during cold start lang ba ito?