Just got a '05 slk55 with 79k miles. Car hadn't been to a dealer for service since 40k miles . The prior owner said he changed oil every 2500 miles. Car looked good to me but don't know much about MB's. Wanted to get it checked by MB and have the usual stuff done. For the B service [my manual calls it service 1-8, not a,b,c] they do oil change and filter and many checks per the service advisor. The b service is $550. I want the trans fluid and filter [if it has one] changed. Thats $570. To change differential fluid is $199. God forbid they find anything else wrong. I skipped the recommended spark plug change at $600 and air filter at $175 as cars seems to run fine. Plan on doing some maintenance myself but wanted to get off to a good start while i learn more about the car. The dealer is in Amityville, Long Island, New York. Do these sound like typical prices? Is a tube of Prep H included?