I have a 1994 E320 Cabrio and am due for my first oil change since I bought the car. My question is why does the dealership charge $70 for an oil change when it costs $20-$25 for most other cars? Am I missing something or is this just another example of MB overcharging?

Thanks!

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1994 E320 Cab (mine)
2001 Chevy Suburban (wife's)
1995 BMW M3 (son's)
1989 Volvo 740 GL (extra car--for sale)