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Message: <blockquote data-quote="tIANcI" data-source="post: 641342" data-attributes="member: 25377">Its because there is no engine oil that can truly handle a 30K service. There is carbon build up, oil degrades because of the heat etc, acids form. Last time when there is no BSRI etc by manufacturers, they want cars to be serviced every 5K etc. Now that they are picking up the cost (actually, passed on to us) they say can handle 30K services. Many BMW addicts will not dare to wait for 30K. Most keep to about 10K on average. So you cannot trust everything these manufacturers say.Also, if you are a low mileage user, its been known that waiting for 30K or 1 year is potentially allowing sludge to build up. So not a good idea at all.</blockquote>