i took my car in for check engine what could be wrong so soon with a car. on 2008 Mercedes-Benz ML550

says timing belt and sparkplugs need to be changed for $950

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2 answers
How old the vechicle is not the only factor. Type of driving (highway/city) and how many miles on the vechicle also matters. They recommend 5 years or 60,000 miles to replace timing belt and at 5 years or 78,000 miles for your spark plugs.
you are due to have this service any time now.