I've been told that when you buy a "new" car, it's wise to have the oil changed around 1,000 miles to remove any loose metal "shavings". Is there any validity to this??

Some people feel differently about this so check with your dealer. The engine is filled with break in oil when new.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

The only answer I can offer about "over-servicing" your car or truck is; it's your money! Do you burn money to keep warm?
Most people follow the factory service schedule(to some degree). Mercedes Benz says to change the oil after 10-12k miles. Rarely do engines have oil related failures when the scheduled services are done.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS M.B. TECH