help! my x5 e53 3.0i m54b30 (2001), consumes lots of oil...i am asking what might be the reason? anyone had similar exp? on 12,000km it drank 5L of oil....it has lpg system in it without own lubricating oil for lpg injectors and i injectors haven't been changed for quite long (i will change them this week)...and i know i have jammed intake vanos...could this be the reason or low oil pressure? or bad oil (i used 10w-40 manoll oil, now i am using castrol 10w-40 and closely watching situtation)? or it is maybe ccv? help