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Message: <blockquote data-quote="t2ribena" data-source="post: 350196" data-attributes="member: 3847">afta 10k km normally on the idrive indicator drop one to two 'box'/point only...no message to ask to top-up... i normally change my engine oil every 10k km...during the oil drain, you can see that the oil got thicker...precursor to the fact that if u dun change oil then slugde built up is unavoidable... that day i was at one of the AB and happen to walk pass the workshop and saw a 523i engine being stripped off...i saw in the engine there is alot of thick sludge and really look like thise play doh kind of texture in the whole engine...i heard this car is serviced based on the CBS thus an oil change is normally at 25k km or more...summore the mileage very low at 50 to 60k km</blockquote>