whats the average/estimated price for a tune up 100,000 miles on 2006 Mercedes-Benz C280

the dash is giving me a service signal with wrenches on it. Its saying that I need service in 300

To whom it may concern;

it would cost about 800.00 dollars to replace spark plugs, oil and filter change, air filter change, cabin filter change, tire rotation, and service reset.

Wow! thank you so much