My dealer says that they don't like the 13000 mile recommended interval for my E350's oil change. The previous owner changed it per their 6500 mile recommendation. I am at that point with the car now. From what I have read the science based on oil analysis supports the longer interval. Furthermore the car needs 2 quarts to top it up which tends to extend the life of the oil. My thinking was a compromise that being top is up with the two quarts and replace the filter at that time. This is based on an article I found on the web where they monitored the oil every 1000 miles. http://neptune.spacebears.com/cars/stories/mobil1.html

Any data based guidance? I hate to break the previous owners tradition of changing it every 6500 but from what I can tell its not worth the extra consumption of resources both mine and the earths.

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MBlovr
'59 180 Dad's original
'59 180 Dad's 2nd one
'67 250SE Dad's last one
'59 220 SE My first one
'62 220SE Coupe second one
'89 190E 2.6 5spd third one
'06 E350 4matic (sold)
'10 E350 4matic