2004 Mercedes c320 class with over 100,000.00 miles on it how much should I pay

pay one hundred dollars, have the 26 point inspection done, the mechanic will size up the cost to replace what's worn and needs maintenance...tally it up then subtract from the asking price....have the work done, then give the asking price...as long as it is made safe and roadworthy at that point~

ask for the hundred dollars back in exchange for the data of the report, if the deal does not go through~

as long as it is smog checked they'll run it on a dynamometer to check the performance of the engine and smog systems...you should get a copy of that data as well~