blog.BavAuto.com -- Most people think that because BMW and MINI call their transmission fluids "Lifetime" or "Extended Service" it doesn't have to be changed. Not true. To get the most out of your transmission and avoid a costly, catastrophic failure, you should change the fluid and filter every 50,000 miles. Watch Bavarian Otto demonstrate how to do this on a BMW E39 (5 series 97 thru 03). You'll find the specific fluid and filter your BMW/MINI needs in our online store at www.BavAuto.com.