Most of the items in the 15K and 30K maintenance recommendations are "check this, check that". There's no reason why a competent DIYer can't perform these tasks, then take any any necessary corrective action such as changing brake pads.

Don't forget the time dependent fluids - anti-freeze and brake fluid.

Assuming you don't find any big problems your parts cost for spark plugs, filters, and fluids shouldn't be more than 50-75 bucks. If you have to install pads at both ends add about another hundred.

The same thing at the dealer will set you back $700 to $900. Most of it is labor, but you don't need an ASE license or Mercedes-Benz tech schools to check brake pads and and most of the other inspection tasks.

I'm doing a 15K check on my 190 tomorrow and changing the clutch slave cylinder.

Duke

Duke