Date registered: Oct 2008
Vehicle: 2008 C350 and a Lightning.
Location: Carlsbad Ca.
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Change your oil when you feel it's necessary, and that can depend on how and where your car is driven.
I plan on keeping mine for some time after it is paid off so I am changing mine every 5,000 miles. That whole 10,000/13,000 mile oil change thing is just MB's way of making the cost of maintenance look more economical (imho).
If you drive these cars hard, they rev pretty high. Your comment about looking at your oil on the dip stick is right on. If it looks dirty and seems to be loosing viscosity, change it.
If anyone has valid info that changing your oil too frequently can cause dammage to your engine, I'd like to see it.