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I have a 2012 335 and I changed my oil myself due to currently living in Germany and having BMW change it was going to cost me 280 euro. When I drained the oil at 15000 miles it was so Black and I found metal shaving in the oil and lots of it. I would recommend changing the oil at least every 7500 to 10000. I have had to put 3 quarts of oil in my car between when car was delivered to me and the 15000 miles. m6pwr it looks like you have owned a few BMWs and you worship the BMW company by the way your saying things but, I have spoken to the service techs here in Germany and they told me I would be wise to change it at the half way point between oil changes. I think it sounds like a wise thing to do.
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