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Message: <blockquote data-quote="willy5" data-source="post: 183582" data-attributes="member: 2319">Was just wondering about engine oil change intervals. The service indicator on mine went on through 20,000 km and still had 1 green light left on it. I decided to make the oil change. The first thing I noticed was a marked improvement in smoothness and response even the gearshift felt smoother I thought that this mignt have been physcological then I noticed that petrol comsumption also improved from 25mpg to 29mpg so I wasn't just physco. (525i) To the more experienced owners, do you actually go by the service indicator or do you change based on mileage and at what mileage? My last oil was Q8 and now I'm on Mobil 1.</blockquote>