I don't want to start one of these huge discussions. I have a 2006 E320 CDI with just a little over 80K. I have used Mobil 1 since new and have changed it "by the book" every 13,000 miles. I have not used a drop of oil in any of the intervals. In fact I had an oil analysis done and the oil report came back with numbers almost equal to new oil -- of course there was soot in oil and some of the parameters did change a little-- but nothing to write home about.

I agree that the lighter components of the oil will burn off first and leave a little more sluge-- ergo you need to change it a little more often. I don't know if anyone has experienced this but sometime just changing the brand will eliminate oil consumption -- going from Penzoil to Shell -- just a thought

3pointstar

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